makeup air dumper to range hood

Malywr said:
Hi everyone I need help how to wire makeup air dumper to range hood over 400cfm When hood is ON make up dumper must open. Or I should temper with range hood and install same size wire as power supply to hood and run it to dumper? or use current transformer next to electrical panel that will detect when hood is energized currently transformer will energize dumper I font want to over complicate something what suppose to be simple


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Does the make up air that’s being brought in have to be located in the general area of the hood or can it just simply be brought into the dwelling anywhere convenient?
 
nizak said:
Does the make up air that’s being brought in have to be located in the general area of the hood or can it just simply be brought into the dwelling anywhere convenient?
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As long as there is no doors in the path of the air flow they can go in a room adjacent to the kitchen.
 
the most effective place is a dampered inlet duct with a discharge grill near the exhaust fan location. That way the supply air to the exhaust fan mixes as little as possible with the conditioned space air. Saving energy and conditioning costs. Depends on building construction and layout.

The further the exhaust fan has to pull the return air through the structure, the less effective the exhaust will function, it consumes HP to move air a further distance through a structure, and will reduce the exhaust fan effectiveness.

It applies whether it's a kitchen hood, a paint booth exhaust, or a dust collector. On larger exhaust exhaust systems, it's common to put a supply blower on the make up air side to have the best performance. For small systems that are non powered make up, the supply size opening is proportionally larger than the exhaust opening to reduce the static pressure and get the exhaust fan to function as efficiently and as short as possible.

The last place you want it to be pulling supply air from, is your vent stacks from your furnace, gas water heater fireplace chimney or dryer vent, especially in a tightly sealed structure. A roof jack is one of the cleaner sources of make up air year round, if it's not buried in snow.

I even did one for high CFM bath fan to help control copious amounts of hir spray from sticking to the floor of one user.
 
I've been looking at these two systems. The Fantech has an option for an electric duct heater. The other system has the heater built in. At about $3K with the heater neither system is cheap.


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infinity said:
The Fantech has an option for an electric duct heater.
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Ok. What happens in warm climates or during the summer months when the MU air has to be cooled? Nothing like working in a 100 degree kitchen with essentially no AC because hot air is being drawn in from outside. Commercial systems pull air through the HVAC systems which heat and cool as necessary. Problem is doing that in a residential setting just for a hood over 750CFM is not something I have heard of. Does anybody make a reversable heat pump MU air system that heats and cools?

-Hal
 
hbiss said:
Ok. What happens in warm climates or during the summer months when the MU air has to be cooled? Nothing like working in a 100 degree kitchen with essentially no AC because hot air is being drawn in from outside.
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That is one reason why you would want the makeup air intake to be close as possible to the hood. I'm kind of surprised that no one has made a hood with the makeup air ducting built in. I did see a custom installation on YouTube where they made a plenum out of the hood enclosure which allowed the makeup air to go directly from the hood plenum right back out of the hood.
 
If you have a competent sheet metal fabricator near you, you could have them make a custom hood that has provisions for inlet and outlet ducts to suit your needs, and avoid the conditioning of the building air, since, if it's well balanced it never mixes with the building environmental air. In and out in the same hood enclosure.

A manual damper adjustment on the exhaust duct will allow you to finely tune the balance to achieve the best balance and performance.

Newer commercial hoods oftentimes come fabricated this way to increase efficiency and environmental conditioning costs.
 
infinity said:
I'm kind of surprised that no one has made a hood with the makeup air ducting built in.
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I don't think MU air is a priority for them. They want to sell cutsie hoods that require minimal installation. MU air provisions would probably triple the cost and require HVAC and tin knockers to install it. I think the MU air requirement is just an annoyance for them. Heck, many of those hoods aren't even vented outside.

-Hal
 
hbiss said:
I don't think MU air is a priority for them. They want to sell cutsie hoods that require minimal installation. MU air provisions would probably triple the cost and require HVAC and tin knockers to install it. I think the MU air requirement is just an annoyance for them. Heck, many of those hoods aren't even vented outside.

-Hal
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Actually I thnik that it will happen with more and more building departments enforcing the more than 400 CFM rule. Most hoods in this category will be vented outside and the need for makeup air in high end kitchens is creating all sorts of design problems such as the make up air being 100° in the summer.
 
Malywr said:
Hi everyone I need help how to wire makeup air dumper to range hood over 400cfm When hood is ON make up dumper must open. Or I should temper with range hood and install same size wire as power supply to hood and run it to dumper? or use current transformer next to electrical panel that will detect when hood is energized currently transformer will energize dumper I font want to over complicate something what suppose to be simple


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Try a pressure switch we use them often MUA dampers on exhaust hoods also for booster fans on dryer exhausts
 
infinity said:
Most hoods in this category will be vented outside and the need for makeup air in high end kitchens is creating all sorts of design problems such as the make up air being 100° in the summer.
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That's what made me think of make-up air being introduced into the HVAC return.
 
hbiss said:
Ok. What happens in warm climates or during the summer months when the MU air has to be cooled? Nothing like working in a 100 degree kitchen with essentially no AC because hot air is being drawn in from outside. Commercial systems pull air through the HVAC systems which heat and cool as necessary. Problem is doing that in a residential setting just for a hood over 750CFM is not something I have heard of. Does anybody make a reversable heat pump MU air system that heats and cools?

-Hal
Click to expand...
Most of the commercial systems I have done, the make up air built into the front of the hood, so conditioned air is not needed. It may be different up north.
 
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