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Old 02-11-2020, 07:44 PM   #16
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Re: Makeup air required for kitchen hood if furnace and water heater are direct vent?


https://www.northlineexpress.com/b-v...rect-vent.html




Direct Vent

In direct-vent appliances, you use special direct-vent pipe recommended by the supplier. The direct-vent system involves two parts, one part for the exhaust and one for combustion air intake. The appliance itself is a completely sealed combustion chamber and no air from the house is used for combustion. The exhaust vents can go either out through a sidewall or through the roof.


https://hvacdirect.com/info/what-does-direct-vent-mean/


What Does Direct Vent Mean?


Direct-Vent Technology describes a gas burning appliance and how it uses two pipes, often one smaller pipe within another larger pipe, to both exhaust the appliances flue gases and bring in fresh air that it uses for combustion. They are one of the safest, most convenient, and most popular ways of adding a gas fireplace to your home. The area where the fire takes place, often called the combustion chamber, is sealed with a glass panel and gaskets that are protected by a safety barrier screen. This allows you to enjoy the view of the fire, prevents fumes from coming into the home, and prevents already heated room air from escaping out the chimney.
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Old 02-12-2020, 06:04 AM   #17
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Re: Makeup air required for kitchen hood if furnace and water heater are direct vent?


Yeah direct vent is a loose term. Fireplaces are a good example.

Just like draft inducer, ventor fan, inducer, combustion air inducer there are loose terms with several meanings.

Problem with the net is we need to see the exact setup and appliance and not all posters understand trade lingo and can describe their situation perfectly.

At the end of the the day it is not a great idea to exhaust huge amounts of air w/o bringing it back in in a safe controlled manner IMO.
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Old 02-12-2020, 06:28 AM   #18
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Re: Makeup air required for kitchen hood if furnace and water heater are direct vent?


How would the kitchen exhaust situation be effected if one has HRV ?
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Old 02-12-2020, 07:25 AM   #19
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Re: Makeup air required for kitchen hood if furnace and water heater are direct vent?


I did a bit of research regarding Broan vent hoods.
They manufacture an "Automatic Make Up Air Damper" that is connected to your furnace via the cold air plenum. It is wired to operate when the hood fan is on. From the plenum there is a damper that is vented outside. When make up air is needed the damper opens and allows outside air to replace the exhausted air.
It seems like it is the most straightforward way to bring in fresh air, condition it and satisfy any negative pressure issues.
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Old 02-12-2020, 07:34 AM   #20
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Re: Makeup air required for kitchen hood if furnace and water heater are direct vent?


Quote:
Originally Posted by SPS-1 View Post
How would the kitchen exhaust situation be effected if one has HRV ?
If the kitchen exhaust is running and removing huge amounts of air it can interfere with the HRV and unbalance it.

It can overload or slow down the HRV fan ( in theory ) and that will unbalance the airflow thru it and potentially cause it to freeze up in very cold climates.

That is if the HRV is taking stale air from vents open to the house. If it is sucking off the return duct only ( bypass setup ) then it may be OK.

My house uses open vents in the bathrooms and one in the kitchen/dining area. That would affect it if I had a huge exhaust fan. A HRV is usually 155 to 200 cfm.
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