© 2006 GE ECM by Regal-Beloit
- 48 -
Indoor Blower Motors
v0.2
Filter sizing -
Probably the biggest problem or at least the one that will creep up the most is the
filter. Make sure that low velocity, high static filters are sized properly and kept clean.
Some of these filters may be too restrictive, even when clean, if they are sized
incorrectly. Low velocity filters such as deep pleated media and electronic air
cleaners typically provide the most benefit for the money with the least amount of
added problems.
• Filters may need to be re-sized if changed from what the manufacturer
supplied and or recommended. Follow the filter manufacturers guidelines and
try to keep the filters pressure drop to less than 0.2 in. wc. unless the
ductwork resistance is low enough to keep the ESP below the recommended
maximum.
• The OEM filter rack may not be large enough for the new filter and a transition
may be required to fit the proper size filter into the duct system.
• Over 1600 CFM many manufacturers of equipment and filters recommend
two filters for proper airflow.
• Two return entrances could be the sides, one side and a bottom or other
depending on the flow of the equipment.
• Always follow the OEM specifications.
MERV ratings are for filter performance but not for filter sizing.
• OEM specs from filter manufacturers are needed for sizing and pressure drop
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