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• Bosch 800 Series 37″ Stainless Steel Downdraft Ventilation – HDD86051UC

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  Abt Model: HDD86051SS

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  Your Price: $1,749.00

  3 out of 5 stars

  Contains 1 Reviews

  Bosch 800 Series 37″ Stainless Steel Downdraft Ventilation – HDD86051UC

  Abt Model: HDD86051SS

  • Height (in) :
    29.38
  • Width (in) :
    37
  • Depth (in) :
    2.75
  • Fan Speeds :
    3
  • Downdraft Size (in) :
    37

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  3 out of 5 stars

  Contains 1 Reviews

  Your Price: $1,749.00

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• GE Universal 30″ Stainless Steel Telescopic Downdraft System – UVD6301SPSS

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  Abt Model: UVD6301SPSS

  In Stock

  Your Price: $1,106. 00

  Regular Price:
  $1,229.00

  4 out of 5 stars

  Contains 8 Reviews

  GE Universal 30″ Stainless Steel Telescopic Downdraft System – UVD6301SPSS

  Abt Model: UVD6301SPSS

  • Height (in) :
    7
  • Width (in) :
    30
  • Depth (in) :
    7
  • CFM :
    500
  • Voltage :
    120 V

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  4 out of 5 stars

  Contains 8 Reviews

  Your Price: $1,106.00

  Regular Price:
  $1,229.00

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• Viking 5 Series 45″ Stainless Steel Rear Downdraft – VDD5450SS

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  Abt Model: VDD5450SS

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  Your Price: $2,899.00

  Viking 5 Series 45″ Stainless Steel Rear Downdraft – VDD5450SS

  Abt Model: VDD5450SS

  • Height (in) :
    29.38
  • Fan Speeds :
    4
  • Light Levels :
    2
  • Frequency (Hz) :
    60
  • Downdraft Size (in) :
    45

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  Your Price: $2,899. 00

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• Zephyr 30″ Stainless Steel Lift Downdraft – DLIE30ASX

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  Abt Model: DLIE30ASX

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  Your Price: $2,399.00

  5 out of 5 stars

  Contains 1 Reviews

  Zephyr 30″ Stainless Steel Lift Downdraft – DLIE30ASX

  Abt Model: DLIE30ASX

  • Height (in) :
    29.38
  • Fan Speeds :
    3
  • Voltage :
    120 V
  • Frequency (Hz) :
    60
  • Downdraft Size (in) :
    30

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  5 out of 5 stars

  Contains 1 Reviews

  Your Price: $2,399.00

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• Gaggenau 400 Series 36″ Stainless Steel Backsplash Ventilation – AL400792

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  Abt Model: AL400792

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  Gaggenau 400 Series 36″ Stainless Steel Backsplash Ventilation – AL400792

  Abt Model: AL400792

  • Voltage :
    120 V
  • Frequency (Hz) :
    60
  • Amps :
    10A
  • Downdraft Size (in) :
    36
  • Labor Warranty :
    2 Years

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• Wolf 36″ Stainless Steel Downdraft Ventilation – DD36

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  Abt Model: DD36

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  5 out of 5 stars

  Contains 1 Reviews

  Wolf 36″ Stainless Steel Downdraft Ventilation – DD36

  Abt Model: DD36

  • Height (in) :
    14
  • Width (in) :
    36
  • Depth (in) :
    2
  • Voltage :
    120 V
  • Downdraft Size (in) :
    36

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  5 out of 5 stars

  Contains 1 Reviews

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• Viking 5 Series 36″ Stainless Steel Rear Downdraft – VDD5360SS

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  Abt Model: VDD5360SS

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  Your Price: $2,699. 00

  5 out of 5 stars

  Contains 2 Reviews

  Viking 5 Series 36″ Stainless Steel Rear Downdraft – VDD5360SS

  Abt Model: VDD5360SS

  • Height (in) :
    29.38
  • Fan Speeds :
    4
  • Light Levels :
    2
  • Frequency (Hz) :
    60
  • Downdraft Size (in) :
    36

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  5 out of 5 stars

  Contains 2 Reviews

  Your Price: $2,699.00

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• Miele DA 6891 36″ Stainless Steel Downdraft Ventilation Hood – 10595910

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  Abt Model: DA6891

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  Your Price: $2,950.00

  Miele DA 6891 36″ Stainless Steel Downdraft Ventilation Hood – 10595910

  Abt Model: DA6891

  • Height (in) :
    25.69
  • Width (in) :
    36
  • Depth (in) :
    4.75
  • Fan Speeds :
    4
  • Voltage :
    120 V

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  Your Price: $2,950.00

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• JennAir 4″ Stainless Steel Modular Downdraft Ventilation – JVD0303GS

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  Abt Model: JVD0303GSS

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  Your Price: $2,549. 00

  2 out of 5 stars

  Contains 1 Reviews

  JennAir 4″ Stainless Steel Modular Downdraft Ventilation – JVD0303GS

  Abt Model: JVD0303GSS

  • Height (in) :
    0.75
  • Width (in) :
    3.88
  • Depth (in) :
    21
  • CFM :
    310
  • Fan Speeds :
    2

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  2 out of 5 stars

  Contains 1 Reviews

  Your Price: $2,549.00

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• JennAir Euro-Style 36″ Stainless Steel Telescoping Downdraft Ventilation – JXD7036YS

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  Abt Model: JXD7036YS

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  Your Price: $1,749.00

  JennAir Euro-Style 36″ Stainless Steel Telescoping Downdraft Ventilation – JXD7036YS

  Abt Model: JXD7036YS

  • Height (in) :
    28.88
  • Width (in) :
    36
  • Depth (in) :
    20
  • CFM :
    600
  • Fan Speeds :
    4

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  Your Price: $1,749. 00

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• Bosch 800 Series 30″ Stainless Steel Downdraft Ventilation – HDD80051UC

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  Abt Model: HDD80051SS

  On Order

  Your Price: $1,699.00

  Bosch 800 Series 30″ Stainless Steel Downdraft Ventilation – HDD80051UC

  Abt Model: HDD80051SS

  • Height (in) :
    29.38
  • Width (in) :
    31
  • Depth (in) :
    2.75
  • Fan Speeds :
    3
  • Downdraft Size (in) :
    30

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  Your Price: $1,699.00

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• Best Cattura 36″ Brushed Stainless Steel Downdraft – D49M36SB

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  Abt Model: D49M36SB

  On Order

  Your Price: $2,550.00

  Regular Price:
  $2,849.00

  4.5 out of 5 stars

  Contains 19 Reviews

  Best Cattura 36″ Brushed Stainless Steel Downdraft – D49M36SB

  Abt Model: D49M36SB

  • Height (in) :
    29. 38
  • Fan Speeds :
    4
  • Light Levels :
    2
  • Voltage :
    120 V
  • Frequency (Hz) :
    60

  On Order

  
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  4.5 out of 5 stars

  Contains 19 Reviews

  Your Price: $2,550.00

  Regular Price:
  $2,849.00

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• Thermador Masterpiece Series 37″ Stainless Steel Downdraft Ventilation – UCVM36XS

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  Abt Model: UCVM36XSS

  On Order

  Your Price: $2,069.00

  Thermador Masterpiece Series 37″ Stainless Steel Downdraft Ventilation – UCVM36XS

  Abt Model: UCVM36XSS

  • Height (in) :
    44.38
  • Width (in) :
    37
  • Depth (in) :
    2.75
  • Fan Speeds :
    3
  • Voltage :
    120 V

  On Order

  Your Price: $2,069.00

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• Broan Elite Eclipse Series 36″ Stainless Steel Downdraft Range Hood – 273603

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  Abt Model: 273603

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  Your Price: $874. 00

  Regular Price:
  $1,008.00

  4.5 out of 5 stars

  Contains 555 Reviews

  Broan Elite Eclipse Series 36″ Stainless Steel Downdraft Range Hood – 273603

  Abt Model: 273603

  • Height (in) :
    29.5
  • CFM :
    600
  • Voltage :
    120 V
  • Frequency (Hz) :
    60
  • Downdraft Size (in) :
    36

  On Order

  
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  4.5 out of 5 stars

  Contains 555 Reviews

  Your Price: $874.00

  Regular Price:
  $1,008.00

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• KitchenAid 36″ Stainless Steel Retractable Downdraft System – KXD4636YSS

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  Abt Model: KXD4636YSS

  Ships From Manufacturer

  Your Price: $1,466.00

  Regular Price:
  $1,629.00

  4 out of 5 stars

  Contains 59 Reviews

  KitchenAid 36″ Stainless Steel Retractable Downdraft System – KXD4636YSS

  Abt Model: KXD4636YSS

  • Height (in) :
    28. 5
  • Width (in) :
    33
  • Depth (in) :
    12.13
  • CFM :
    585
  • Fan Speeds :
    4

  Ships From Manufacturer

  
  Free Shipping

  4 out of 5 stars

  Contains 59 Reviews

  Your Price: $1,466.00

  Regular Price:
  $1,629.00

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• Zephyr 36″ Stainless Steel Lift Downdraft – DLIE36ASX

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  Abt Model: DLIE36ASX

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  Your Price: $2,499.00

  Zephyr 36″ Stainless Steel Lift Downdraft – DLIE36ASX

  Abt Model: DLIE36ASX

  • Height (in) :
    29.38
  • Fan Speeds :
    3
  • Voltage :
    120 V
  • Frequency (Hz) :
    60
  • Downdraft Size (in) :
    36

  Special Order

  
  Free Shipping

  Your Price: $2,499.00

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• Best Cattura 48″ Brushed Stainless Steel Downdraft – D49M48SB

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  Abt Model: D49M48SB

  On Order

  Your Price: $3,150. 00

  Regular Price:
  $3,499.00

  5 out of 5 stars

  Contains 3 Reviews

  Best Cattura 48″ Brushed Stainless Steel Downdraft – D49M48SB

  Abt Model: D49M48SB

  • Height (in) :
    29.38
  • Fan Speeds :
    4
  • Light Levels :
    2
  • Voltage :
    120 V
  • Frequency (Hz) :
    60

  On Order

  
  Free Shipping

  5 out of 5 stars

  Contains 3 Reviews

  Your Price: $3,150.00

  Regular Price:
  $3,499.00

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• Best Cattura 30″ Brushed Stainless Steel Downdraft – D49M30SB

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  Abt Model: D49M30SB

  On Order

  Your Price: $2,350.00

  Regular Price:
  $2,599.00

  4.5 out of 5 stars

  Contains 9 Reviews

  Best Cattura 30″ Brushed Stainless Steel Downdraft – D49M30SB

  Abt Model: D49M30SB

  • Height (in) :
    29.38
  • Fan Speeds :
    4
  • Light Levels :
    2
  • Voltage :
    120 V
  • Frequency (Hz) :
    60

  On Order

  
  Free Shipping

  4. 5 out of 5 stars

  Contains 9 Reviews

  Your Price: $2,350.00

  Regular Price:
  $2,599.00

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• Broan Elite RMDD 36″ Stainless Steel Telescopic Downdraft Range Hood System – RMDD3604

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  Abt Model: RMDD3604

  On Order

  Your Price: $1,549.00

  4 out of 5 stars

  Contains 78 Reviews

  Broan Elite RMDD 36″ Stainless Steel Telescopic Downdraft Range Hood System – RMDD3604

  Abt Model: RMDD3604

  • Height (in) :
    29.5
  • CFM :
    600
  • Voltage :
    120 V
  • Frequency (Hz) :
    60
  • Amps :
    4A

  On Order

  
  Free Shipping

  4 out of 5 stars

  Contains 78 Reviews

  Your Price: $1,549.00

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• Thermador Masterpiece Series 37″ Stainless Steel Downdraft Ventilation – UCVP36XS

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  Abt Model: UCVP36XSS

  On Order

  Your Price: $2,369. 00

  3 out of 5 stars

  Contains 1 Reviews

  Thermador Masterpiece Series 37″ Stainless Steel Downdraft Ventilation – UCVP36XS

  Abt Model: UCVP36XSS

  • Height (in) :
    47.38
  • Width (in) :
    37
  • Depth (in) :
    2.75
  • Fan Speeds :
    3
  • Voltage :
    120 V

  On Order

  3 out of 5 stars

  Contains 1 Reviews

  Your Price: $2,369.00

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Downdraft Ventilation – Rangehoodguide.com

What is a Downdraft Ventilation?

A downdraft vent, also known as a downdraft vent or vent hood, is basically a range hood which is installed behind or next to your cooking stove. When you’re not cooking, the downdraft ventilation isn’t visible, but when needed you can retract it. Once the downdraft vent is fully extended, it will suck in the air pollutants and either transport them out of your house or filter the air and recirculate the cleaned air back into your kitchen.  Downdrafts vents come in both stand-alone versions, which need to be installed into your kitchen counter, as well as in downdraft range versions. A downdraft ranges, also known as downdraft stove, is basically a whole range (stove +cooktop) which already contains an integrated downdraft vent. Downdraft ventilation systems are typically used by (but not limited to) people with a kitchen island. The reason for having a downdraft as your island cooktop vent  is that some people really don’t want to have a big kitchen island range hood hanging above their beautiful open kitchen island, because it obstructs their view and takes away the ‘open kitchen feel.’ That’s why a lot of them have opted for a downdraft ventilation. 

Note: There are also downdraft models which don’t extend, but are pretty much just a vent grill located next to your cooking stove. Please steer clear of those!

Why you SHOULD get a Downdraft Ventilation

The most obvious reason to get a downdraft vent is because it looks incredibly sleek. Being able to pop-up and retract your downdraft vent in and out of your countertop really makes you feel you’re standing in the kitchen of the future. The only thing that could enhance the experience is to have a release of carbon-monoxide accompanied with a psssshhh-sound every time you’re extending your downdraft vent. Downdraft vents truly are incredibly aesthetically pleasing. Trust us when we say that having one in your kitchen means capturing the attention of every visitor. So don’t be surprised when your friends turn out to be green with envy.

A more pragmatic reason to choose a downdraft vent over a regular range hood is the space you will be saving. As we’ve mentioned before, some people consider a regular range hood to be a bulky eye-sore. Although that might be a matter of taste, we can’t deny that range hoods tend to take up a lot of precious kitchen real-estate. As available space in kitchens can be in short supply, getting a downdraft vent can absolutely save you a lot of space, because it’s integrated into your kitchen counter or downdraft range. It will pop up when it’s in use, and retracts back into your counter or downdraft range when not in use. 

Why you SHOULDN’T get a Downdraft Ventilation

Downdraft vents obviously have their shortcomings. For starters, they generally cannot match the performance of regular range hoods. The reason for this can be summed up in one word: physics. Hot air naturally rises. When you’re cooking food, the resulting hot air together with the smoke, airborne oil particles and food smells, will rise upwards. This is the reason why range hoods are traditionally installed ABOVE your stove, as it makes it much easier to capture the air pollutants. Downdraft ventilations, on the other hand, are installed NEXT to your stove. So, instead of capturing the naturally rising air pollutants from above your cooktop, downdraft vents try to capture the pollutants by sucking them in from the side. This is obviously a much harder feat to accomplish, as downdraft vents will have to fight the natural tendency of hot air rising. In practice, this means that downdraft ventilations will need to be equipped with a lot more sucking power (CFM) compared to regular range hoods. But with great power not only comes great responsibility, it also comes with a legal obligation to provide MAKEUP AIR. And even with a lot of CFM under the hood, it’s very hard to beat the effectiveness of traditional range hoods.

Note: Having a downdraft vent with a lot of power (CFM) can be problematic for people with a gas stove. Especially when your downdraft vent is turned up to its maximum capacity, the flames on your stove might start to flicker and produce or even fully extinguish.
Another drawback of having a downdraft vent can be found in the maximum height of your downdraft relative to the height of your pots. If the pots you’re cooking in are taller than your downdraft ventilation, the air pollutants (which are naturally floating upward) can’t possibly be captured by your downdraft vent, because your downdraft isn’t tall enough to reach the fumes in the first place. However, since the maximum height of a downdraft vent will differ from model to model, please pay close attention to it when buying one. Simply measure the height of your tallest pot and compare it to the maximum height of the downdraft vent or downdraft range. (We recommend getting a downdraft vent with a max height of 18 inches.)

Note: The height issue can be especially problematic for people using gas cooktops with downdrafts, as gas stoves usually have elevated grills to place your pots and pans on so as to leave room for the gas burners. When measuring your pots and pans, add this elevation to their height. Obviously, this isn’t the case with flat electric ranges.

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Conclusion: Downdraft Ventilation, yes or no?

Having a downdraft ventilation in your kitchen means having an incredibly stylish range hood solution. The kid in you will probably let you make the downdraft go up and down repeatedly for at least the first hour after having it installed in your kitchen. Downdraft vents are just that futuristic and sleek. Another great feature of downdraft vents are that they are hidden when not in use, as they will be retracted back into your kitchen counter or  downdraft range. Especially in kitchens with a limited amount of kitchen space this might prove to be an ideal solution., as well as in kitchens with a kitchen island, because having a downdraft ventilation as your island cooktop vent  will allow you to keep that ‘open kitchen feel.’ 

There are, however, some drawbacks when it comes to downdraft vents. For starters, they’re generally not as effective as regular range hoods, because they have to fight physics. Hot air rises, which is why normal range hoods are installed above your cooktop. Downdraft ventilations, however, are positioned next to your cooktop, which makes them have to suck the air in from the side rather than from the top. Not only will this translate in a loss of effectiveness compared to regular range hoods, it also requires a lot more power to do so. There’s also a height issue with certain downdraft ventilation models. Their maximum height has to exceed the maximum height of your tallest pots, otherwise you.

Downdraft Ventilation Suggestions

If you’re still interested in buying a downdraft ventilation system, please check out these models:

How much CFM does your new range hood need?

Check out our FREE GUIDE to buying a new range hood  to check how much CFM your range hood will need. (Includes a downloadable PDF on page 1).

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how does it work and where can i install it?

Every day a person spends tons of air for his own needs, in particular, for breathing. In addition, it also pollutes the air in the course of its life. Therefore, a house, apartment, place of work and all other premises in which people are located must have such an important element as exhaust ventilation.

Types of ventilation at home

Exhaust ventilation system

To make it comfortable for a person to be indoors, it is necessary not only to provide access to fresh air at an acceptable temperature, but also to determine the speed of its movement. No one likes a draft, and everyone reacts to even slight changes in the speed of movement of air masses. This is where the differences begin when natural exhaust ventilation or its mechanical device is used.

The main feature influencing the choice of ventilation system is the speed of movement of the air flow:

• for mechanical – from 3 to 5 m3 / s;
• for natural – less than 1 m3 / s.

Naturally, the lower the speed, the more comfortable the person. But one problem arises, for the solution of which supply and exhaust ventilation, that is, a mechanical system, was created. The situation is that at low speeds, in order to provide the required amount of air flow to create natural ventilation, it is necessary to use openings of a much larger diameter. For a mechanical ventilation system, this problem is solved by creating artificial pressure. Thus, a much smaller hole cross section is required to move air.

Natural ventilation is undoubtedly preferable, however, due to design features, it is often not possible to create it correctly, because it is impossible to make such holes in the walls without violating building codes. Therefore, mechanical ventilation is used in apartment buildings and large buildings.

Naturally ventilated house

Both systems are designed in such a way that the air inflow is always natural and the air outflow depends on the chosen system. It is necessary that even with closed doors, the rooms are interconnected, and the air can circulate freely. To do this, it is necessary to provide transfer grids in the door leaf or leave a distance from the door to the floor of at least 20 mm.

Types of air supply equipment and methods of its installation

Exhaust ventilation of the house is formed from the systems of inflow and outflow of air masses. The flow of air into the house, as already mentioned, is carried out naturally. For this, both elementary ventilation and opening of windows, and the installation of special transmission devices are used.

Before the widespread installation of plastic windows, the most important air supplier was wooden window systems. In addition, houses are built in such a way that air penetrates through walls, communications and other devices. If these “suppliers” of air are not enough, then additional transmission devices are used to ventilate the room:

1. ventilation holes in plastic windows;
2. air filtration valves;
3. wall valves behind or near the radiator;
4. suction fans.

Functioning of the ventilation system

Complete renewal of the air in the room when installing plastic windows in the ventilation mode is achieved in up to 75 minutes (depending on the size of the room). At the same time, the process of ventilation in winter is accompanied by the formation of frost on the rubber surfaces and condensation on the windows themselves. Therefore, in modern systems, additional air supply devices are used. Ventilation slots in plastic windows can be ordered simultaneously with their manufacture; they cannot be installed on already installed plastic windows.

To solve the problem, wall dampers or infiltration valves are often installed. They are installed near the window blocks in the walls in such a way that the penetrating air can be heated from the radiator, and the valve itself can be masked with a curtain.

In areas with severe winters, dampers can be installed immediately after the radiator, so that when air enters the room, it has time to heat up to an acceptable temperature. In addition, this will solve the problems with masking the device. The capacity of most valves varies between 50 – 100 m3 / h, which perfectly provides the premises with fresh air.

Exhaust ventilation in the room

Exhaust ventilation device involves the installation of ventilation devices and the ventilation system itself. Equipment includes devices directly: air valves, silencers, fans, etc. The ventilation system consists of air distribution devices and equipment.

Air handling unit

During the construction of any house, private or multi-apartment, the project provides for the creation of special shafts, which are made of brickwork. Attached mines are also used in private houses.

The system is arranged in such a way that the most “polluted” room in terms of air – a bathroom and a kitchen – will be the last in the ventilation system. If the cross-sectional dimensions of the exhaust ventilation openings are sufficient for the natural outflow of air, then there is no need to install additional equipment. If you start building a private house from the foundation and correctly design the air renewal system, then the ventilation exhaust valve is simply closed with special grilles.

These valves are available in many different configurations, including adjustable outlets. When installing devices, you must select a valve that meets the parameters of your system. Since the valves used for natural ventilation are not quite able to cope with artificial exhaust systems.

Exhaust ventilation in the apartment, as a rule, uses additional equipment for forced air exchange, for example, fans in bathrooms. Such fans are installed directly on the hood or on a suspended ceiling. Their inclusion is carried out simultaneously with the inclusion of electricity in the room. In this case, there is a small delay (no more than 50 seconds).

For the kitchen, the forced ventilation device is presented as a kitchen hood. It, as well as a fan in the bathroom, can be installed with your own hands. In addition to improving air circulation, the cooker hood also removes soot and unpleasant odors that occur during cooking.

Supply and exhaust ventilation is completely mechanical and has one huge drawback – an increase in the cost of heating the room. At the same time, blowing equipment is installed on the air inlet, for example, a fan, which takes air from the street and brings it into the house. Recall that the installation and use of natural air intake systems is possible at the stage of construction or major repairs.

The blower is very often located on balconies and loggias. It brings fresh air into the room. But its heating during cold periods of time occurs due to internal heat sources – heating batteries, as a result, heating costs increase. In addition, during the removal process, the air leaves the room heated, that is, using such a system irrationally, you actually heat the room. In order to reduce the loss of energy resources, systems with recuperation are used.

Heat recovery ventilation system

Heat recovery system is a system in which heat exchange between incoming and outgoing air masses is provided. In other words, the air in such a system heats itself. This process is organized through the use of appropriate equipment.

The system uses a recuperative unit in which the upward and downward air flows intersect, resulting in heat exchange. Thus, the air itself returns heat to the room.

The unit has all the functions of a supply fan. However, the device is designed in such a way that, apart from heat exchange, nothing is transferred – no odors, pollution and dust.

Such a ventilation system is significantly more expensive than a supply and exhaust analogue. However, it will justify the efforts and funds invested from the moment it begins its work. Since the average savings on energy resources will be 60%. In addition, the system can be retrofitted with an automatic control unit that will monitor the atmosphere in the room and tell you when filters and other components need to be replaced.

Ventilation systems with textile ducts

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Textile ventilation

S. Mikhnenko

One of the new ways of designing centralized fresh air supply systems combined with cooling is ventilation ducts made of textile materials. Such systems have their own characteristics and a number of advantages

One of the largest cost items in building centralized air conditioning systems is the cost of ventilation ducts. Traditionally, they are made of galvanized steel, stainless steel or aluminum, which is expensive.

The idea of ​​replacing metal ventilation ducts with other materials is not new. Various plastics and “black” sheet with cheaper anti-corrosion coatings than a zinc layer were considered, for example, powder paints.

The most interesting and promising approach is to use textile materials for air ducts with normalized air permeability. Using this method of manufacturing ventilation ducts, it is possible to provide a very comfortable supply of fresh air, adjust the necessary humidity, avoid drafts and noticeable temperature unevenness in the same room.

Room ventilation systems with textile air ducts (VTV) are divided into three main types with different principles of air distribution. In passive low momentum systems, air diffuses through the permeable material. In high-impulse systems, air is distributed exclusively through special profiled openings or nozzles. Hybrid systems are a combination of passive low-pulse systems with a laser-cut array of holes in a textile channel or a series of specially shaped nozzles.

Material for ventilation ducts – a special high-strength synthetic fabric with normalized porosity. It is specially processed to give it non-flammable and anti-static properties.

Let’s take a closer look at how passive low-pulse room ventilation works through solid textile channels. Such ventilation is widely used in industrial, recreational and residential (office) premises, see fig. 1 and 2.

Fig. 1. Textile low-pulse ventilation in a spa, Holland

2. Textile low-pulse ventilation at WILO SE, Germany

3. shows the main schemes for the execution of textile ventilation – low-pulse, high-pulse and hybrid in different versions – suspended (O), ceiling (1/2O) and corner (1/4O, in the form of a frieze). The main differences in their functioning are the different nature of the distribution and intensity of the cooling fresh air flows. In the photo in fig. Fig. 3 shows visualization of flows using smoke, however, with a high difference in temperature and moisture content between the supplied air and the room itself, in some cases the supply air actually looks like a slight fog.

The principle of operation of low-impulse room ventilation is that, due to the difference in density of the cooled air, which is heavier than the warm air in the room, the supply air moves towards the floor, displacing, mixing and entraining warmer air. The movement of the air flow in the room is based on the natural movement of air due to the difference in density and the occurrence of convection currents, as well as heating processes from heat transfer. The high level of heat radiating from heat sources in the room (e.g. equipment) creates even more convection currents. As a result, the air is mixed even more and entrains the air around the heat sources more. This leads to stratification of flows in the ventilated room, heat and “exhaust” air are removed from the “occupied zone” and directed to the ceiling. The calculation of such systems is quite complicated, and the simulation is performed on specialized computer systems.

Low-impulse systems, first of all, provide a uniform and non-directional air flow. This allows you to avoid getting into the area where people are located (the so-called “occupied area”) flows that cause thermal discomfort and can lead to colds.

Fig. 3. Varieties of “textile” ventilation

“Occupied zone” is an area in a room where people stay for a long time and, generally speaking, this is an area in which measures are taken to maintain the indoor climate at a given level. “Occupied area” is not standardized. When designing a ventilation system, this area is determined by agreement with the architect and the customer. The occupied area is often defined as the area from the floor to a height of 1.8 m for standing people and to a height of 1.1 m for seated people (see Figure 4).

For horizontal low-impulse systems, the “near zone” is also defined – the area under the textile duct, where there is the greatest risk of being hit by a cold downdraft or draft. The width of the near zone is usually at a distance of no more than three diameters of the ventilation duct. For vertical low impulse systems, the near zone is defined as the local area around the duct where the air velocity is too high compared to the room comfort requirements (depending on the room category). This zone can be larger if the supply stream of cooler air “flows” along the wall, and is not freely distributed in the room (see Fig. 4). A well-designed system prevents streams from entering the occupied area at a rate higher than that specified by sanitary and hygienic standards.

Fig. 4. “Occupied zone” – an area with a given microclimate

Figure 5 shows a typical flow pattern in a suspended horizontal impulse system for scenarios A, B, C, D – heating, ventilation and two cooling scenarios with different cooling load per meter of duct.