10x33x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Grow Light Ballasts (up to) 1 Wet 23

(up to) 1 Wet 23 11 2 Wet 52 24 3 Wet 78 36 1 Dry 7 3 2 Dry 16 7

and any air system that requires half-inch (1/2") air condition filters

which activates your HVAC equipment before a scheduled event

It is the must-have for propagating clones in your large-scale commercial growing environment

10x33x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Grow Light Ballasts (up to) 1 Wet 23Nordic 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