Having a hard time with this install. Customer has a chef kitchen and 1200cfm range hood exhaust hood. Very tight foam house. Are there any systems out there that would a dehumidify and heat fresh air entering house. Never done one this big , and do I really need to dehumidify? Cleveland Ohio.. Anybody have any experience in this field?
Residential Make up air for range hood
qwest1
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Having a hard time with this install. Customer has a chef kitchen and 1200cfm range hood exhaust hood. Very tight foam house. Are there any systems out there that would a dehumidify and heat fresh air entering house. Never done one this big , and do I really need to dehumidify? Cleveland Ohio.. Anybody have any experience in this field?
1,200 cfm exhaust fan basically needs it's own heating and air system.
You need a makeup air unit.
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These systems usually only move about half of their rating. So you only need 600 cfm of make-up air. Wow! install a 12" duct to the outside, connected to the mainfloor air handler. Use a electric damper in the make-up air duct connected to the exhaust blower. With relays activate the damp and furnace blower when the exhaust fan operates. Add a whole house dehumidifier like the Ultra-Aire 155H with the %RH control located in the center of the home. Between the a/c and whole house dehu, you will have reasonable humidity control.
Regards TB
That will never maintain temperature in the home. Especially with a heat pump system.
Code requires you bring in the same amount of air that is exhausted when you get that big.
The homeowner can hope that his existing system will handle the load when they run it.
Or they can have you install provisions to handle the situation when it comes up.
Either way, cover your butt.
I saw a huge indoor grill with A short circuit fan near the hood.I did not put it in I think it was a modern-air?
I would check into the manufacturer of the hood.They have to have something to deal with negative pressure if they make a hood that large.
I would check into the manufacturer of the hood.They have to have something to deal with negative pressure if they make a hood that large.
Run the appropriate size outside air duct (14" or so) to the largest furnace that's in the house with a louver on the outside of the house and have a OA damper open and furnace fan go to high when the exhaust hood is turned on. At least if the OA is extreme the furnace will help temper the air and dehumidify a little.
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I heard that someplace before and I like it.
Regards TB
I just thought that some company makes something for this application. I was thinking about taking a inline fan for the makeup air , running it into a pleated filter section then scr controlled inline electric heater . then dumping air into space. Put a speed controller on both motors so the homeowner would have to set controllers at the same setting. If you do it with just a damper you might be bringing in more air than needed if hood is not on full speed. But with this I will not be able to dehumidify
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You could run an outside air duct to the main air handler inlet, and use a damper to open it up when the hood is running....
in all actuality, this may end up being a blessing in disguise, as tied with the proper thermostat, this would provide an economizer mode of operation as well. (large homes almost never take advantage of evening cool weather, because there is just far too many windows to open up - and this would provide that free cooling/heating without any intervention, and ensuring that the air that IS brought in is filtered, unlike an open window.
in all actuality, this may end up being a blessing in disguise, as tied with the proper thermostat, this would provide an economizer mode of operation as well. (large homes almost never take advantage of evening cool weather, because there is just far too many windows to open up - and this would provide that free cooling/heating without any intervention, and ensuring that the air that IS brought in is filtered, unlike an open window.
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If this is a kitchen that warrants a 1200 cfm hood, you likely won't need a heater on the make-up...
better check with furnace manufacturer to see how much cold air can be brought into unit without damaging heat exchanger. 0 degree air hitting a hot heat exchanger could cause cracking.
Possibly dump the fresh air into the return duct as far away from the furnace as possible allowing the air to get tempered a bit before reaching unit.
I have also ran a duct up the wall behind the range, with a nice aluminum grill , and connected to outdoor louver and zone damper.
Basically, the hood would pull fresh air from right below/behind range. That install did not get tempered air. Just sucked it in and exhausted it out.
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I think that's the 'short circuit' method someone mentioned up above.
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In a tightly sealed home, a 1200 CFM range hood can create substantial negative pressure, necessitating a makeup air system to balance the air being exhausted. In terms of heating and dehumidifying incoming fresh air, there are ERV (Energy Recovery Ventilator) systems that can do this. ERVs transfer heat (and in some cases, humidity) between the outgoing and incoming air streams, helping to precondition the incoming air. Whether you need to dehumidify depends on your local climate - in Cleveland, Ohio, your primary concern would likely be heating incoming air in colder months rather than dehumidifying. Remember, it's crucial to consult with an HVAC professional experienced in high CFM range hoods and makeup air systems to design a solution that meets the home's specific needs and local building codes.
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