Measuring Exhaust Air Flow With Ve, He, Ec And Sa Filters - Spring Air Systems Dynaflow Installation And Maintenance Manual

Measuring Exhaust Air Flow with VE, HE, EC, and SA Filters
VE= standard grease extraction efficiency Stainless steel baffles.
HE= High grease extraction Efficiency Cascade baffles for Enviro applications and reducing grease
discharge from buildings.
EC= Easy Clean Teflon – standard grease extraction efficiency baffles for hot, heavy grease laden
appliances.
SA= Spark Arrestor – standard grease extraction efficiency, for solid fuel appliances.
Measuring Instruments:
VANAXIAL VELOMETER
Follow the instruments instruction manual to measure the exhaust volume at each filter. The instrument will either measure
the total CFM or average velocity of each filter. Hold the instrument perpendicular to the face of each filter. The
Velometer should be within 1" of the filter face for best results. Once the each filter average exhaust velocity has been
measure use Chart No.1 to convert Average Filter Face Velocity to CFM.
The total exhaust volume is the sum total of each filter CFM.
Baffle Filter
Size
in x in mm x mm
20 x 16 508 x 406
20 x 20 508 x 508
20 x 25 508 x 635
BAFFLE FILTER
BACK OF
HOOD
GREASE CUP
Measuring Exhaust Air
Exhaust Air Flow VS Average Filter Face Velocity
100 fpm/0.5m/s
CFM l/s
200 94
260 123
320 151
2"
VELOMETER
INSIDE HOOD
CANOPY
Figure 24
Average Filter Velocity
200 fpm/1.0m/s
CFM l/s
400 189
520 245
640 302
Chart No. 1
300 fpm/1.5 m/s
CFM l/s
600 283
780 368
960 453
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