Air Bear 20x25x5 (4 7/8) Air Filter Replacement MERV 13 Plus Carbon 1 Pack grow-systems-trays-reservoirs thereby making conventional fertilizer utilization

thereby making conventional fertilizer utilization much more efficient

UV resistant

VLGR Technology – Delivers energy efficiency and allows for the smoothest environmental control over your grow

Optimized Phosphorus Utilization – Patented technology helps plants absorb and protect phosphorus sources for maximum reproductive output

Eight speed options are available with power on/off switch

Air Bear 20x25x5 (4 7/8) Air Filter Replacement MERV 13 Plus Carbon 1 Pack grow-systems-trays-reservoirs thereby making conventional fertilizer utilizationImportant 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 3 8 and 5 1 4 inch depth filters,