9
5.0
AIR FLOW BALANCING
• A magnehelic gauge capable of
measuring 0 to 0.25 inches water
gauge (0 to 62.5 Pa) and
2 plastic tubes.
• Two flow collars (6” diameter).
What you Need to Balance the Unit
Preliminary Stages for Balancing the Unit
Insert the flow collars in the duct at each location. Make sure their arrows are pointing in
the direction of the airflow. Tape collars in place temporarily.
Installation of Flow Collars
VP0005
VP0008
A
36¨(914mm)
12¨(304mm)
OR
B
12¨(304mm)
F
G
Flow collar
Seal all the unit ductwork with tape. Close all windows and doors. Turn off all exhaust
devices such as: range hoods, dryers and bathroom fans. Make sure balancing dampers are
fully opened
(F and G in Figure 5 below).
Choose appropriate locations for the 2 flow collars according to Figure 5:
• On the exhaust air duct (first measuring location, A)
• On the fresh air distribution duct (second measuring location, B)
• At least 36”(914 mm) away from the unit; at least 12”(304 mm) before or after a
90° elbow; at least 12”(304 mm) away from a register.
Figure 5
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