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RATE OF EXHAUST FLOW CALCULATIONS
Based on the 1996 International Mechanical Code.
The Rate of air flow required for a vent hood is
calculated using the following definitions:
Q = Rate of Air Flow in Cubic Feet Per Minute
or [ CFM ] Required for the Hood.
A = Area of Hood Opening in Feet
2
= (L x W)
D = Clearance Height = Distance in Feet from
lower lip of hood to top of dishwasher
chamber.
P = Perimeter of Hood that is Open. This
depends on the hood design, as follows:
If there are four open sides (Island Design), the calculation of the Rate is as follows:
Q = 75 x A
If there are three or fewer open sides, the calculation of the Rate is as follows:
Q = 50 x A
As an alternate method, the Rate can be calculated as follows:
Q = 50 x P x D
Example:
L = 3 W = 3 D = 2
alumroFnoitaluclaCretemirePalumroFnoitaluclaCretemireP
alumroFnoitaluclaCretemireP
alumroFnoitaluclaCretemirePalumroFnoitaluclaCretemireP
ngiseDdooHngiseDdooH
ngiseDdooH
ngiseDdooHngiseDdooH renroCllaWdnalsI
sediSnepOforebmuN nepOsediS2nepOsediS3nepOsediS4
=P W+LW+W+LW+W+L+L
snoisnemiD teeFteeFteeF
snoitaluclaCetaRsnoitaluclaCetaR
snoitaluclaCetaR
snoitaluclaCetaRsnoitaluclaCetaR
ngiseDdooHngiseDdooH
ngiseDdooH
ngiseDdooHngiseDdooH renroCllaWdnalsI
sediSnepOforebmuN nepOsediS2nepOsediS3nepOsediS4
Ax57=Q MFC576
Ax05=Q MFC054MFC054
DxPx05=Q MFC006MFC009MFC0021
NOTE: Any listed and labeled factory-built
commercial exhaust hood tested in accordance
with UL Standard 710 by a nationally recognized
testing laboratory, should be installed according
to the terms of its listing and the manufacturer's
installation instructions.
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LENGTH
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CLEARANCE
HEIGHT
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WIDTH