21_1/4x23_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack ph-ec-tds-meters-and-solutions taper-ground blade with an impulse-hardened

taper-ground blade with an impulse-hardened non-set tooth design for greater cutting efficiency

adjustability and control

25-inch long Christmas tree and nursery shearing and shaping knife:

Orders placed after Thursday at 8 AM PST ship the following week

21_1/4x23_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack ph-ec-tds-meters-and-solutions taper-ground blade with an impulse-hardenedNordic 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