20x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 1 Pack environmental-controllers parasites and diseases in organic

parasites and diseases in organic and conventional crops

Accurate dual-beam CO2 sensor

The simplicity of this thermostat and its small design make it a useful addition to any grow room

The ultra-quiet blower system is designed to cool home theaters

20x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 1 Pack environmental-controllers parasites and diseases in organicImportant 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,