Rate of Exhaust Flow Calculations

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.

Based on the 1996 International Mechanical Code.

The Rate of air flow required for a vent hood is calculated using the following definitions (Fig. 6):

Q= Rate of Air Flow in Cubic Feet Per Minute or [ CFM ] Required for the Hood.

A = Area of Hood Opening = (L x W) in Feet2

D= Clearance Height = Distance in Feet from lower lip of hood to top of dishwasher chamber.

➤				➤
➤				WIDTH
CLEARANCE	➤	LENGTH	➤	WIDTH
			➤
			➤
HEIGHT
➤

P = Perimeter of Hood that is Open. This
depends on the hood design, as follows:		Fig. 6
depends on the hood design, as follows:

Perimeter Calculation Formula

Hood Design	Corner	Wall	Island

Number of Open Sides	2 Sides Open	3 Sides Open	4 Sides Open

P =	L + W	L + W + W	L + L + W + W

Dimensions	Feet	Feet	Feet

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
			Rate Calculations

	Hood Design		Corner	Wall	Island

	Number of Open Sides		2 Sides Open	3 Sides Open	4 Sides Open

	Q = 75 x A				675 CFM
	Q = 50 x A		450 CFM	450 CFM
	Q = 50 x P x D		600 CFM	900 CFM	1200 CFM

– 10 –

ML-110974, AM14TC, AM14T, AM14F, ML-110973 specifications

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