RenewAire SL70H Instruction Sheet Download Page 1

Instruction Sheet: SL70H, SL70L

Airflow Balancing Instructions

BALANCING

 

Balancing an airflow is done by setting the Outdoor Air fan speed and then adjusting the Return Air fan speed to 
eject the same or somewhat less air to the outdoors.
Equipment required for testing airflows:

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   A magnehelic gauge (or manometer) or other device capable of measuring 0–1.0 in. w.g. of differential pressure.

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   2 pieces of natural rubber latex tubing, 1/8" I.D., 1/16" wall thickness works best.

Manometers are relatively inexpensive devices that are readily available from online retailers. Accuracy within 
the range of 0–1.0 in. w.g. is the critical measure. Water manometers generally have graduations of 0.1" that are 
difficult to accurately determine. For all manometers, there are two plastic tubes that connect at the manometer 
and then the other ends go to pressure ports on the SL.
Individual differential static pressures (DP) are measured ACROSS the core, using the installed pressure ports 
located on the removable door.

USE THESE TWO PRESSURE PORTS TO 

CHECK PRESSURE DROP FOR THE RA 

AIR STREAM

USE THESE TWO PRESSURE PORTS TO 

CHECK PRESSURE DROP FOR THE OA 

AIR STREAM

FIGURE 1.0 PRESSURE PORT LOCATIONS

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