Fantech VHR 704 Installation Manual - page 10
10
AIR FLOW BALANCING
1 For this flow measuring station, cut the duct
and place the flow measuring station between
each section of duct. Make sure that the flow
measuring station’s air direction arrow points
in the direction of the airflow. Secure the flow
measuring station with duct tape.
2 Before taking the reading, make sure that the
magnehelic gauge is level and at 0. Refer to
the flow measuring station’s chart to
determine your unit’s airflow velocity.
3 Adjust the “Supply Air Out” damper until you
reach the desired velocity. Follow the previous
steps to adjust the “Exhaust Air Out” damper,
if needed.
B
Measure
here
Measure
here
12”
(300 mm)
12”
(300 mm)
• To avoid airflow
turbulence and incorrect
readings, the airflow
velocity should be
measured on steel
ducting a minimum of
12” (300 mm) from the
unit or elbow and before
any transition.
AIRFLOW STATION (GRID) METHOD
* Fantech’s superior design and use of EBM motors results in a steep fan curve that
usually does not require balancing. Commissioning the system after installation is
recommended which include confirming the proper operation of the system and how
it interacts with other components within the home.