20x20_1/2x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack veg-and-bloom Water them in

Water them in

a T-splitter and a special 4 ft RJ12 / PushLock Waterproof Connector cable

so you stay cool throughout long shifts

moisture resistant beverage board frame

20x20_1/2x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack veg-and-bloom Water them inNordic 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