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WaterFurnace Geothermal 28x30x2 MERV 10 PowerGuard Air Filter 4 Pack MERV 10 The first stage is a DFS FUJ SF0022x2 AC16DO16KIT BNDLKIT LZAS The first stage is a 2" particulate pre filter treated with a microbial growth inhibitor FTYN35DV3B depending upon conditions and lifestyle The PowerGuard for WaterFurnace and is considered by WaterFurnace to be the OEM replacement MERV 10 air filter for all their Geothermal Comfort Systems that use a 28 x 30 x 2 pre filter
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