11_1/2x11_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Tents / Indoor Greenhouses 40” / 1/25 / 1mm

40” / 1/25 / 1mm

• Reduce the odor from botanical pesticides and fungicides

and help shield plant roots from pathogens and disease

which can lead to root disease

Perlite -horticultural grade

11_1/2x11_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Tents / Indoor Greenhouses 40” / 1/25 / 1mmNordic Pure Custom MERV 14 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