16x21_1/2x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Drying Racks Give your plants the highest

Give your plants the highest quality horticultural light available while minimizing energy consumption

2 to 3 feeds per day are generally enough for 60/40

Air Pressure: Max 25 mm WG (2500 Pa or 10" WG)

Compatible with all Age Old™ liquid products

The 4 compressed coir sheets expand to 1 cu ft

16x21_1/2x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Drying Racks Give your plants the highestNordic Pure Custom MERV 10 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