20x22_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack cube polarographic probe with 3m cable

polarographic probe with 3m cable

Guard ‘n Spray is an organic

Only one operator required

high-performance operation

PVC suction tube

20x22_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack cube polarographic probe with 3m cableNordic 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