Manufactured by Airguard and is considered by WaterFurnace to be a suitable upgrade to the OEM replacement MERV 11 air filter for all their Geothermal Comfort Systems that use a 24 x 24 x 2 pre-filter.
The replacement filters used with WaterFurnace units that use a 24 x 24 x 2 pre-filter must use a filter that is a full 24" x 24". If you use a smaller filter such as many of the 23 1/2" x 27 3/4" filters sold by other manufacturers, your filter will not seal properly and you could get unfiltered air leaking around the edge of the filter, this is called bypass.
The manufacturer suggested replacement interval is 4 to 6 months, depending upon conditions and lifestyle.
For instructions on how to change your furnace's air filter, please refer to your unit's Owner's Manual.This package ships with 12 filters.