16x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 4 Pack control system Exhaust fans with high CFM

Exhaust fans with high CFM ratings can create too much negative air pressure that the canvas walls flex inward

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BotryStop WP's competitive exclusion mode of action makes it an ideal rotation partner and a cornerstone of any Integrated Pest Management (IPM) program

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This formula has been specially designed speed up absorption rates and can start affecting your plants within a couple of hours after use

16x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 4 Pack control system Exhaust fans with high CFMImportant 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,