High Velocity Cartridge Filters Exhaust

High Velocity Cartridge Filters

A. Exhaust

With all the filters in place, determine the total hood exhaust	1/4 Width
volume with a rotating vane anemometer as follows:

1.All cooking equipment should be on. If the hood has internal short circuit make-up air, it should be turned off.

2.Measuring Velocities

•Velocity measurement should be taken at three locations per filter.

These must be over the inlet opening as shown in Fig. 35.

•Measure the velocity of each location. A digital 2.75 in. (70 mm) rotating vane anemometer or its equivalent is suggested. The center of the anemometer should be held 2 in. (50 mm) from the face of the filters as in Fig. 31. It is helpful to make brackets to keep the anemometer at the 2 in. (50 mm) distance and parallel to the filter. Both squareness and distance are important for accuracy.

3.Calculate the average slot velocity.

4.Calculate the CFM per linear foot by dividing the average velocity by a conversion factor listed in the following table.

5.Calculate the hood’s exhaust volume by multiplying the CFM per linear foot by the length of hood.

1/2 Width

1/4 Width

Fig. 35

2 in.

Rotation Vane

Anemometer

Fig. 36

Cartridge Filter Size	Imperial		Metric
Cartridge Filter Size	Conversion Factor		Conversion Factor
	Conversion Factor		Conversion Factor

16 in. (400 mm) high with 4 in. (100 mm) high inlet	1.63	1/ft3	5.35	1/m3
20 in. (500 mm) high with 4 in. (100 mm) high inlet	2.15	1/ft3	7.05	1/m3
16 in. (400 mm) high with 7 in. (120 mm) high inlet	1.24	1/ft3	4.07	1/m3
20 in. (500 mm) high with 7 in. (120 mm) high inlet	1.58	1/ft3	5.18	1/m3

Example:

Measure the slot velocities in fpm for a 9 ft. (2.74 m) hood with four 20 x 20 in. (500 x 500 mm) filters with standard opening, three readings per filter.

Average slot velocity	=	Sum of Velocity Readings
		Number of Readings
(Imperial)	=	5330	=	444.2 fpm
(Imperial)	=	12	=	444.2 fpm
		12
(Metric)	=	97474	=	8123 m/hr
(Metric)	=	12	=	8123 m/hr
		12
CFM per linear foot	=	Average Slot Velocity
		Conversion Factor
	=	444.2 fpm			=	206.6 cfm/linear foot
	=	2.15			=	206.6 cfm/linear foot
		2.15
	=	8123 m/hr			=	1152 m3/hr
	=	7.05			=	1152 m3/hr
		7.05

Filter Readings (fpm)

470	440	425

482	430	453

455	431	441

399	439	465

Filter Readings (m/hr)

8595	8047	7772

8815	7864	8284

8321	7882	8065

7297	8028	8504

Hood exhaust volume =		CFM/linear foot (m3/hr / m)	x	Hood Length
=		206.6	x	9 ft.	=	1859.4 cfm
=		1152	x	2.74 m	=	3156 m3/hr

22	Canopy Hood					®

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