16x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 14 Air Filters 4 Pack Synthetic Pro Edition 5-18 in diameters

5-18 in diameters

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Rootshield Plus is also available in a wettable powder formulation

The Flowmaster by Hydrologic measures how many gallons of filtered water have gone through the your grow system and alerts you when it's time to change filters

Please call us for recommendations if you plan on applying predatory mites to a large area or multiple sites

16x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 14 Air Filters 4 Pack Synthetic Pro Edition 5-18 in diametersImportant 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,