21_1/2x23_3/8x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack grow-light-reflectors With an industry leading 4

With an industry leading 4 horse power motor and air capacity of 3000 CFM

Once hatched

The Smart Volt electronic 120 to 277 volt ballasts are energy efficient and high output

For any requirements specific to your state or tribe

21_1/2x23_3/8x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack grow-light-reflectors With an industry leading 4Nordic 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