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Old 05-07-2014, 07:43 AM
hvac877 hvac877 is offline
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Default Air filters
A 1" filter pleated MERV 7 will work and should be replaced every 3 months. There are two things to consider:
1. The filter rack will need to be adjusted from 4" to a 1" so the filter does not move.
2. The filter is tight fitting so no air bypasses the filter element.

The 4" filter give you more filter surface and is supposed to last longer. For the added expense It is not worth it.
I use pleated filters in my HVAC system and purchase them locally.
Last edited by hvac877; 05-07-2014 at 07:45 AM. Reason: mispelled and added some info