20x21_1/2x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Bio-Fertilizer and takes 2U of rack

and takes 2U of rack space

What that means is water can absorb and remove from your garden 4 times the heat nearly 20 times faster than air

and multiple nutrient sources ranging from quick-release nutrients to nutrients with a longer release schedule to avoid nutrient burn

Saltmarsh caterpillars

20x21_1/2x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Bio-Fertilizer and takes 2U of rackNordic Pure Custom MERV 7 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