23_1/2x23_1/2x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack misc Controlled Release: For preventative use

Controlled Release: For preventative use

or benchtop use

A robust internal structure means a healthy immune system

Threaded probe head allows for simple installation direct into an irrigation line for effective in-line measurements

Bugs may return (as is possible with any insect control)

23_1/2x23_1/2x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack misc Controlled Release: For preventative useNordic Pure Custom MERV 8 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