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Kitchen Exhaust fan duct sizing
- Thread starter marthab
- Start date
MECHJAMIECTA
Mechanical
Are you talking residential kitchen or commercial kitchen?
- Thread starter
- #3
Fans have a performance curve that defines cfm vs. external pressure drop.
Step 1: Find this curve for your fan.
Step 2: Decide how many cfm you need, and use the curve to identify the corresponding allowed external pressure drop.
Step 3: Size the duct for that pressure drop at the required cfm.
Step 1: Find this curve for your fan.
Step 2: Decide how many cfm you need, and use the curve to identify the corresponding allowed external pressure drop.
Step 3: Size the duct for that pressure drop at the required cfm.
marthab,
This isn't an exhaust hood over a cooking appliance, is it? If so, you'll have to also consider keeping the velocity of the air high enough to entrain the particulates and grease. If not a kitchen application, listen to MintJulep.
Good on ya,
Goober Dave
This isn't an exhaust hood over a cooking appliance, is it? If so, you'll have to also consider keeping the velocity of the air high enough to entrain the particulates and grease. If not a kitchen application, listen to MintJulep.
Good on ya,
Goober Dave
Marthab
I do not know where you live, but here is a PDF of the code guidelines where I live. Most states are not that much different.
Pay attention to page 10.
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
I do not know where you live, but here is a PDF of the code guidelines where I live. Most states are not that much different.
Pay attention to page 10.
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
Berkshire
I am surprised that NFPA 96 is not part of the listed standards governing the design and installation of kitchen exhaust systems in your neck of the wood.
Also: NFPA 96 allows lower velocities as low as 500 FPM nowadays for some specific applications such as Melink control systems.
I am surprised that NFPA 96 is not part of the listed standards governing the design and installation of kitchen exhaust systems in your neck of the wood.
Also: NFPA 96 allows lower velocities as low as 500 FPM nowadays for some specific applications such as Melink control systems.
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