21x23_1/2x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack dupe so feet are more cool

so feet are more cool and comfortable even as you sweat

9 inch digital heat pad

the computer you are already data logging to will need permanent internet access

Each 25 ft section comes with 2 large zip ties

These grow tents offer waterproof liners

21x23_1/2x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack dupe so feet are more coolNordic 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