25x30x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack pumps-&-irrigation this compact inline filter works

this compact inline filter works quietly in the background to protect your plants and the beneficial microorganisms that make them thrive

it is visibly clear and leaves no residue

which is important for healthy clones

The heat mat improves germination by warming the root area 10-20°F over ambient temperature

25x30x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack pumps-&-irrigation this compact inline filter worksNordic Pure Custom MERV 13 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition