17_3/8x35x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack grow-system/-trays/-reservoirs Elastic closures for secure fit

Elastic closures for secure fit

These shoe covers help protect against heat stress

Built for the connoisseur who admires the finer things in life

This product is sold in pairs

17_3/8x35x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack grow-system/-trays/-reservoirs Elastic closures for secure fitNordic Pure Custom MERV 12 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