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Question for MadMom

gjander's picture


You mentioned in another post somewhere that you had a make-up air unit installed that was connected to your range hood to automatically balance the air pressure in your home when the hood is turned on.  Do you happen to know the manufacturer of the unit you have?  There is a thread on this topic going on at Breaktime and a couple of manufacturers have been mentioned but I'm trying to find all the alternatives.





MadMom's picture

(post #53890, reply #1 of 10)

Gary, would love to help you, but that wasn't me.  I vaguely recall the post you're referring to, but can't remember who posted it.  Sorry.

Things are going to get a lot worse before they get worse.
Lily Tomlin

gjander's picture

(post #53890, reply #2 of 10)

Oh, my apologies.  I somehow had it in my mind that you posted that.  I'll have to dig through the archives to see if I can find the message I'm thinking of.


PeterDurand's picture

(post #53890, reply #3 of 10)

I posted something about it not too long ago. This house is very air tight and has a heat recovery air exchanger that changes the air 2 1/2 times an hour. But it keeps it balanced. So when I have the cooktop fan going, it would create a partial vacume...a no no. The local powers that be told me at the time that I should install an equal size fan to provide intake make up air. And I did, in a far away corner of the house. There are no closed doors between that one and the cooktop. And they were right. Both fans are connected to the same adjustable switch. With both working at max setting, a kleenex will be sucked up to intake filter. If I disable the intake, and with all doors and windows closed same kleenix will not be held up to the filter.

As far as brand, I don't remember. The inline fans were purchased at a place that does commercial installations and the ductwork was made to accomendate them.

Hope this helps.



gjander's picture

(post #53890, reply #4 of 10)

Thanks--that might have been the message I was thinking of.  Our general contractor is looking into it now so hopefully they will find a solution that won't break the bank.

UncleDunc's picture

(post #53890, reply #5 of 10)

So what does it cost to heat all the warm air you blow out in the winter? Or do you live on Chinese carry out when it's cold? :)

PeterDurand's picture

(post #53890, reply #6 of 10)

What does it cost anyone to get rid of smoke/grease in their homes? No different here. I can adjust the speed to the occasion. Without dedicated make up air you will just be sucking longer and drawing in through the cracks. Possibly along with moisture to settle in the walls. I suppose ideally you could vent the make up air to enter close to source of smoke/grease. Is there an HVAC engineer out there?



UncleDunc's picture

(post #53890, reply #9 of 10)

I see your point and I wasn't trying to be snotty. I've lived most of my life in houses with no range hood, or one that only recycled the air. Most of those houses have been in places where it gets cold in the winter. For us, the cost of getting rid of grease and smoke was having to scrub the kitchen periodically.

If I were faced with sucking a bunch of cold air into the house in the winter, heating it and blowing it back out, and couldn't find or couldn't afford a heat recovery ventilator big enough to handle the hood fan airflow, I suspect that my reaction would be to give up grease and smoke until spring. And if you live in an airconditioning climate, the issues are similar.

Jean's picture

(post #53890, reply #7 of 10)

Most of the heat from fireplaces is lost up the chimney too. And the hole in the top of the teepee is really a heat loser. I missed your point here.

Oh, forget it... it doesn't matter.


When you are over the hill, you pick up speed. .

A  clear conscience is usually the sign of a bad memory.
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RobtSeattle's picture

(post #53890, reply #8 of 10)

Com'l installs of make up air units often have a make up heat unit.  It could be any kind of heat sourse including  a heat exchanger.

Picture the radiator of your car. Pass the heated air that is being sucked out of the house thru the inside of this heat exchanger and pull the replacement air across the outside.  If it is sized correctly, much of the heat from in the house will be return via warmed up make up air. In Washington state this would be required by code.

UncleDunc's picture

(post #53890, reply #10 of 10)

I think those make a lot of sense, but I never or very seldom see them mentioned in range hood discussions.