17_1/2x21x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Grow Light Reflectors Whether you’re growing in soil

Whether you’re growing in soil

you will see a larger

- Works with 250w through 1000w

Does not include duct clamps

17_1/2x21x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Grow Light Reflectors Whether you’re growing in soilNordic 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