Airflow Balancing - SystemAir Fantech AEV Serie Manuel D'installation

10

Airflow balancing

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.
• 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 The duct's airflow velocity is measured with a magnehelic gauge and a pitot tube. See "Pitot Tube
Balancing Procedure" next page.
B This airflow measuring station reads the airflow by being connected to the ducting.
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.
Air
Flow
18"
(460 mm)
Measure
here
Duct
Pitot
Tube
Magnehelic
Gauge