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Balancing the Airflows
Balancing the airflows is critical to ensuring that the amount of air introduced from the outside of
the building equals the amount of air exhausted to the outside of the building. If these two airflows
are not properly balanced, the following issues may occur:
A positive or negative pressure in the house
ERV may not operate at its maximum efficiency
The unit could malfunction
Airflow Measuring Gauges
The magnehelic gauge and the digital manometer are suitable
instruments for the balancing of airflows.
A magnehelic gauge with a correct scale for the ERV is suitable for
accurately measuring air duct velocity. The value on the gauge will
be velocity pressure. A digital manometer requires the ability to
display differential pressures at 3 digits of resolution. (See Figure A)
Gauge Attachments
When sampling an airflow, various attachments
are available for use on a magnehelic gauge or
digital manometer.
Consult with your Lifebreath distributor for
available options such as a pitot tube, flow
measuring station, and an airflow measuring
probe.
Figure B illustrates a magnehelic gauge with a
scale with a pitot tube attachment. This
combination will measure the system air
velocity pressure accurately, regardless of the
duct size or shape (either round or rectangular).
Airflow
Pitot tube
Low
Pressure Side
Magnehelic gauge with a pitot tube attachment
Figure A
Magnehelic Gauge
DUCT
High Pressure
Side
Magnehetic
Gauge
Figure B
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