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RATE OF EXHAUST FLOW CALCULATIONS

Based on the 1996 International Mechanical Code.

The Rate of air ow required for a vent hood is

calculated using the following denitions (Fig. 14):

Q = Rate of Air Flow in Cubic Feet Per Minute

or [ CFM ] Required for the Hood.

A = Area of Hood Opening in Feet

= (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

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.

➤

LENGTH

➤

CLEARANCE

HEIGHT

➤

WIDTH

Fig. 14

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

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

AM15 Dishwasher Technical Manual Page 21 of 83

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Automate AM1.5 Guide de l'utilisateur Page 21

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