Kitchen Exhaust fan duct sizing
Kitchen Exhaust fan duct sizing
(OP)
How do I size the duct for an exhaust fan with 1450 cfm and 1,324 rpm.
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Kitchen Exhaust fan duct sizing
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RE: Kitchen Exhaust fan duct sizing
RE: Kitchen Exhaust fan duct sizing
RE: Kitchen Exhaust fan duct sizing
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.
RE: Kitchen Exhaust fan duct sizing
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
RE: Kitchen Exhaust fan duct sizing
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.
http://
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
RE: Kitchen Exhaust fan duct sizing
RE: Kitchen Exhaust fan duct sizing
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.
RE: Kitchen Exhaust fan duct sizing
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