20x20_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack grow-systems-trays-reservoirs LED : 1716

LED : 1716

Non-toxic and safe to use around people and pets when used as directed

Iron oxide

Use 1:1 Ratio with Master A&B as a two-part Base Bloom Nutrient

20x20_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack grow-systems-trays-reservoirs LED : 1716Nordic Pure Custom MERV 14 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