21_1/2x23_5/16x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack garden-accessories Quantity Treatment Area Shipping Method

Quantity Treatment Area Shipping Method

The desiccant packs reduce RH down to 50% but won't absorb below that level

Available in 10 sizes

Heavy releases – 500 adults per whitefly "hot spot"

5°C /±1°F pH Calibration Automatic

21_1/2x23_5/16x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack garden-accessories Quantity Treatment Area Shipping MethodNordic 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