Residential hood with makeup air

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Yup. If MUA is a fan
 
hbiss said:
It depends on the BTUs of the gas cooking appliances. It's common today for kitchens to have at least 6 burner ranges, double ovens, griddle, grill, etc. A 1000+ Cfm vent hood with makeup air is not at all unusual. This should be designed by an HVAC guy with credentials in air balancing and ventillation, not the EC or GC.

-Hal
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Just because someone likes to show off the fact they can afford the larger 6 burner range doesn't mean they use more than one or two burners at a time very often. Some cases maybe they have large family or regularly cook for a larger number of people though. Then it would be more important to know how to size things

Have electric range at my house, only have two surface elements that get used for the most part.
 
Fred B said:
I've had issue with a simple stock residential hood, the home was very well sealed with insulation and whenever exhaust hood was run or even the dryer it would create enough vacuum to snuff out the pilot on the water heater and the oil furnace would fault out because of it. Had to install a simple actuated baffle that would open to allow for makeup air when heat was running, it worked from the heating unit not the exhaust hood. I know not quite the same thing, but goes to show the residential hood can create enough vacuum to be an issue.
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Modern high efficiency gas furnaces typically draw and exhaust combustion air from outside and wouldn't affect air pressure inside the building.
Not so many standing pilot water heaters other than existing ones anymore. But they do need sufficient combustion air regardless or you could even have exhausting issues with them.
 
kwired said:
Modern high efficiency gas furnaces typically draw and exhaust combustion air from outside and wouldn't affect air pressure inside the building.
Not so many standing pilot water heaters other than existing ones anymore. But they do need sufficient combustion air regardless or you could even have exhausting issues with them.
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Exactly what was there older furnace and water heater.
 
kwired said:
Just because someone likes to show off the fact they can afford the larger 6 burner range doesn't mean they use more than one or two burners at a time very often.
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That's a standing joke with me. People will spend over $100K on a kitchen with the most expensive appliances and they eat take-out because nobody knows how to cook.

Just like the expensive cars in the garage, they think it makes them look good to other people.

-Hal
 
James L said:
I've been asked to install, vent, and wire a residential hood that's 1,200 cfm. I know I need a makeup air, too.
I've never wired a redidential makeup air unit.
I have no specs or cut sheet for the hood, so I'm curious what's typical for connecting the MUA to the hood. Is it a particular hood type, with auxiliary power out for MUA?

Maybe similar to a downdraft vent that has remote blower getting powered from main unit?
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A residential hood rated to move 1200 CFM of air is way overkill.
The size of a residential hood (MUA) doesn’t need rocket science to figure out the CFM rating.
Generally. . . the size of MUA (if you need one) is based on the size of the stove/range cook top.
Residential size of stove/range top is 32” wide some are 36”.

Since most ranges come with ovens they are also factored in.
Regular homes do not really need MUA. . . but if the owner wants it. . . it is fair to say that “customer is always right”. lol

You did mention that the owner asked you to install the hood-- which means they already have it.
Just make him aware that every time he is using the hood vent –doors inside the home would slam close or open depending on the orientation.
It could also suck the conditioned air out of the house.

MULTIPLY the width of the range by 10 to arrive at the right CFM for moving air.

So, if you have stove/range with 32” width you will end up with 320 CFM of air needed to be moved- - which is ample for consumer size hood.

If it turns out to be oversize . . . throw-in a speed regulator.
The max size of hood that requires makeup air is over 400 CFM.
Try this site:
rangecraft.com

What is a Good CFM for a Range Hood? -

This article looks at what makes a good CFM for a range hood and the reason why it is important when purchasing a new range…
rangecraft.com rangecraft.com

or

Ask Mr. Google.

Note:

Keep mind that some older homes have their water heaters or furnaces indoors but they are required to have their non-motorized MUA.
It is just an opening on the wall or floor if it’s raised floor.

Also, the interlocking scheme for MUA motor has been explained in details by other posters.

Good luck
 
myspark said:
A residential hood rated to move 1200 CFM of air is way overkill.
The size of a residential hood (MUA) doesn’t need rocket science to figure out the CFM rating.
Generally. . . the size of MUA (if you need one) is based on the size of the stove/range cook top.
Residential size of stove/range top is 32” wide some are 36”.

Since most ranges come with ovens they are also factored in.
Regular homes do not really need MUA. . . but if the owner wants it. . . it is fair to say that “customer is always right”. lol

You did mention that the owner asked you to install the hood-- which means they already have it.
Just make him aware that every time he is using the hood vent –doors inside the home would slam close or open depending on the orientation.
It could also suck the conditioned air out of the house.

MULTIPLY the width of the range by 10 to arrive at the right CFM for moving air.

So, if you have stove/range with 32” width you will end up with 320 CFM of air needed to be moved- - which is ample for consumer size hood.

If it turns out to be oversize . . . throw-in a speed regulator.
The max size of hood that requires makeup air is over 400 CFM.
Try this site:
rangecraft.com

What is a Good CFM for a Range Hood? -

This article looks at what makes a good CFM for a range hood and the reason why it is important when purchasing a new range…
rangecraft.com rangecraft.com

or

Ask Mr. Google.

Note:

Keep mind that some older homes have their water heaters or furnaces indoors but they are required to have their non-motorized MUA.
It is just an opening on the wall or floor if it’s raised floor.

Also, the interlocking scheme for MUA motor has been explained in details by other posters.

Good luck
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The most common household ranges are 30" wide. Cooktops and ovens may vary.
 
The range hood I'll be installing is 48 inches.
I agree that (at least typically) 1200 cfm is way overkill.

Maybe they're gonna cook a lot of bacon...
who knows 🤷‍♂️🤷‍♂️
 
James L said:
I agree that (at least typically) 1200 cfm is way overkill.
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From myspark's link:
For instance, a burner with an output of 35,000 BTUs requires a kitchen range hood that provides 350 CFM to clear the air effectively.
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So let's see. Prosumer ranges are available with at least 6 burners that can be 35,000 btu each. That would require a 2100 CFM exhaust system. You are in the commercial kitchen arena.

-Hal
 
hbiss said:
From myspark's link:


So let's see. Prosumer ranges are available with at least 6 burners that can be 35,000 btu each. That would require a 2100 CFM exhaust system. You are in the commercial kitchen arena.

-Hal
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That's 210,000 btu 🤔

That would be a ridiculous set-up, because the gas pipe more than likely wouldn't be big enough. I think most houses around here only have a 1-inch gas supply, which would only be big enough if that range was less than 30 ft away from the meter.
 

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retirede said:
I’ve never seen a residential cooktop with more than 60,000 total BTU. Most are half that.
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I think most small burners are about 8,000, medium burners are about 12,000, and large burners are usually 15 - 20,000. I'm not sure how much the oven would use, but you are probably about right.

I think some of the higher end ovens are using bigger burners. Wolf and Viking has some burners that are 25 - 30,000 but that's not every burner.

I think it's safe to say a 48 in unit might use up to 120,000 running on max
 
texie said:
I happen to have a GE Monogram 36" 6 burner cooktop. Each burner is 17,000 BTU. So about 100,000 BTU total. It has a 700 CFM hood above it.
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That’s unusual. Very rare are that all burners the same output. Normally a couple are quite a bit smaller for small pots and/or simmering.

I think my 5 burner has a 15,000, two 10,000s and two 5,000s.
 
retirede said:
That’s unusual. Very rare are that all burners the same output. Normally a couple are quite a bit smaller for small pots and/or simmering.

I think my 5 burner has a 15,000, two 10,000s and two 5,000s.
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One of the things I really like on this cooktop is that, while all the burners are the same size, each can be set down low enough that you can let things like spaghetti sauce simmer without burning. Another nice thing is the grates all run together to create a smooth top so you can slide pots to other positions. It's really been the best cooktop I've ever had.
 
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