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24 BALANCING THE AIRFLOWS – PITOT TUBE
Figure Callouts:
(1) 3/16 in. Hole
(2) Pitot Tube Tip
(3) Digital Manometer
(4) Balancing Damper
Steps:
1. Drill a 3/16 in. hole in the duct, ideally 3 ft. downstream and 1 ft. upstream of any elbows or
bends in the fresh air and stale air streams.
2. Insert the pitot tube with the tip facing towards the air stream in the “Stale Air from Inside”
stream. Move the pitot tube around in the duct (facing toward the airflow) and take an
average reading. Record the reading.
3. Repeat Step 2 to measure the “Fresh Air to Inside” stream.
4. Review the readings and damper down the duct with the highest duct velocity pressure.
Repeat Steps 2 and 3 until both ducts show identical readings. Upon completion of balancing,
seal the holes with foil tape.
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