Spring Air Systems Dynaflow, Installation And Maintenance Manual

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16
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.
2"
VELOMETER
BAFFLE FILTER
GREASE CUP
BACK OF
HOOD
INSIDE HOOD
CANOPY
Measuring Exhaust Air
Figure 24
Exhaust Air Flow VS Average Filter Face Velocity
Baffle Filter Average Filter Velocity
Size 100 fpm/0.5m/s 200 fpm/1.0m/s 300 fpm/1.5 m/s
in x in mm x mm CFM l/s CFM l/s CFM l/s
20 x 16 508 x 406 200 94 400 189 600 283
20 x 20 508 x 508 260 123 520 245 780 368
20 x 25 508 x 635 320 151 640 302 960 453
Chart No. 1