20x20x4 (3 5/8) Pleated MERV 14 Air Filters 6 Pack commercial-lighting-fixtures Number of sites: 23

Number of sites: 23

Hardware pack (LRAALHDWARE) must be order separately

Compatible with all LightRail 3

They will not harm mammals

In thorough tests conducted by the Humboldt Nutrients team throughout the hills and valleys of Northern California this specific solution of Ca and Mg dominated the competition in side-by-side trials

20x20x4 (3 5/8) Pleated MERV 14 Air Filters 6 Pack commercial-lighting-fixtures Number of sites: 23Important 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. If you are replacing a 4 3 8 depth 20x20x4 filter