ASHRAE Research Project 1480 Report - Food Service Technology ...

Single Island Wall Hood Filter Velocity Profiles
Filter velocity measurements were taken on the single island rear filter canopy hood at 2000 and
4000 cfm. Readings were recorded for each of the six filters with a 4-inch rotating vane
anemometer traversing flush to the filter face. The profiles are shown in Figure 4.
2000 cfm
Filter Velocity [fpm]
500
450
400
350
300
250
200
150
100
50
0
198
200
225
244
218
208
1 2 3 4 5 6
4000 cfm
Filter Velocity [fpm]
500
450
400
350
300
250
200
150
100
50
0
376
388
446
478
410
389
1 2 3 4 5 6
Figure 4. Single Island Rear Filter Canopy Hood Filter Velocities
The velocity trends were similar at both airflow rates. At 2000 cfm, the overall average filter
velocity was 215 fpm towards the center of the filter bank. The maximum velocity was 244 fpm
and the minimum filter velocity was 198 fpm at the end of the filter bank. At 4000 cfm, the
overall average filter velocity was 314 fpm. The maximum velocity was 478 fpm towards the
center of the filter bank and the minimum filter velocity was 376 fpm at the end of the filter
bank.
2-3
RP-1480