Fantech AEV 1000 Nstallation, Operation And Maintenance Manual - Air Flow Balancing
Magnehelic
Magnehelic
Gauge
Duct
Air
Flow
Pitot
Tube
B This airflow measuring
station reads the
airflow by being
connected to the
ducting.
A The duct’s airflow velocity
is measured with a
magnehelic gauge and a
pitot tube. See “Pitot Tube
Balancing Procedure” next
page.
• To avoid airflow
turbulence and
incorrect readings, the
airflow velocity should
be measured on steel
ducting a minimum of
18” (457 mm) from the
unit or elbow and
before any transition.
• The balancing procedure consists of measuring the exhaust air leaving the system and the
supply air entering the system and ensuring that these two are equal. A deviation of 10% or
less is acceptable. In such cases, it is recommended to have a greater amount of exhaust air
than supply air as so to increase the supply air’s temperature.
AIR FLOW BALANCING
PRACTICAL
TIPS
• If the unit’s airflows are not
properly balanced...
- The unit may not operate at
it’s maximum efficiency.
- The unit’s use could cause
negative or positive pressure
in your home causing cold air
to enter or other combustible
equipment to backdraft.
A
*
B
*
Pitot tube and gauge
Measure
here
18”
(460 mm)
8
Fan Tech at
kitchen
::
accessories
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