30x30x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack light These refill sheets are compatible

These refill sheets are compatible with standard growing trays such as in the Speed Starter Kit

can be wiped out with one application

or horizontal

Find your plant variety and rooting powder strength now

Thrips and Root Aphids

30x30x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack light These refill sheets are compatibleNordic Pure Custom MERV 12 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