20x28x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Chemicals Best for (crops): lettuce

Best for (crops): lettuce

This parasite can be used year-round in greenhouses and outdoors as it is not affected by short-day lengths

until it locates onto the stand designed into the tray

ADDITIONAL EQUIPMENT REQUIRED FOR OPERATION OF UNIT

FDA Approved

20x28x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Chemicals Best for (crops): lettuceNordic 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