17
PITOT TUBE OR ANEMOMETER
Spring Air Systems has factory calibrated the average filter slot velocity VS filter CFM. Measure the average bottom slot
velocity of each filter and use Chart No. 2 to convert the slot velocity to total filter CFM.
Each filter has a series of open and closed slots across the face. Hold the instrument perpendicular to the open filter slot at
the bottom of the filter. Place the hot wire anemometer directly in the filter slot. Take one reading at the bottom of each
slot as shown in Figure 25 below. Calculate the average slot velocity for each filter. Refer to Chart No.2 below for the
corresponding filter exhaust volumes. Sum each filter CFM to determine the total hood exhaust volume.
2
1
BACK OF
HOOD
INSIDE HOOD
CANOPY
PITOT
TUBE
BAFFLE FILTER
Measuring Exhaust Air
Figure 25
Measure velocity here at
the bottom of the slot.
Summary of Contents for Dynaflow
Page 23: ...21 Chart No 4...
