15x18x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack fans-ventilation-ducting organic matter and fertilizers of

organic matter and fertilizers of all types

and other plants

EASY TO USE: To raise your PPM's follow the directions and hang 1 GRAND DADDY PAD above your canopy per every 800 cubic feet of garden space

Works perfectly with our 10" x 20" web trays

Assembled Unit Includes:

15x18x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack fans-ventilation-ducting organic matter and fertilizers ofNordic Pure Custom MERV 13 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