HE4XRT
Due to continuing product development, specifications are subject to change without notice.
© 2012 RenewAire LLC
134775_005 HE4XRTMan_Jan12.indd Revised 01/2012 www.renewaire.com
Page 11
Measuring Airflow
Equipment Required
• A magnehelic gauge or other device capable of measuring 0
to 1.5 in. water of differential pressure.
• 2 pieces of natural rubber latex tubing, 1/8” ID, 1/16” Wall
works the best. NOTE: Be sure to remove cap from pressure
port before inserting tubing. Insure tubing is well seated
in pressure ports. NOTE: The tubing should extend in the
pressure port approx. 1 inch.
Cross Core Static Pressure Measurement Instructions
• The individual differential static pressures (DSP) can be
measured using the installed pressure ports located in the
front of the units core access doors. NOTE: These ports
have been carefully located on the unit as to give you the
most accurate airflow measurement. NOTE: Do not relocate
pressure ports.
• To read SCFM of Fresh Air (FA) install the “high” pressure side
(+) of your measuring device to the Outside Air (OA) port and
the “low” pressure side (-) to the Fresh Air (FA) port.
• To read SCFM of Room Air (RA) install the “high” pressure
side (+) of your measuring device to the Room Air (RA) port
and the “low” pressure side (-) to the Exhaust Air (EA) port.
• Use the reading displayed on your measurement device to
cross reference the CFM output using the conversion chart.
NOTE: Be sure to replace cap into pressure port when air
flow measuring is completed.
ONLY
RTH, RTF
RA
OA
FA
RTV, RTF
ONLY
RTV, RTR
ONLY
RA
RTH, RTR
FA
ONLY
FRONT
VIEW
E-box
Pressure Taps (4)
EA
Differential Static Across Core DSP vs. CFM
HE4XR
T
DSP 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00
Fresh Air
(FA)
CFM 1450 2030 2600 3180 3760 4340 4910 5490 6070
Room Air
(RA)
CFM 840 1370 1900 2430 2960 3480 4020 4550 5080
The proper operating airflow range for this model is 1000 -
4400 CFM.
