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The sensor will detect the environmental parameters then send the collected data back to the Hydro-X Plus
These loose round plugs fit perfectly into the Gro-Block hole
Three Prong 120v Plug
8" open end for sealing
20x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 4 Pack MH The sensor will detect theImportant Note: Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air conditioner filter. It's best if you measure your air filter for the EXACT size and compare it to our "Actual Size" and then you can be sure your A C air filter fits! With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer. We also carry 4 7 8 and 5 1 4 inch depth filters,
