18x28x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack Grow Light Reflectors But CalCarb is an unusual

But CalCarb is an unusual form of calcium carbonate that is highly unstable

"Finally a controller that supports both my veg and flower rooms independently

and a decontaminant which dissipates rapidly

Size:  4" x 4" x 7 to 8"

True to its form the Airis Turboo doubles as a keychain

18x28x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack Grow Light Reflectors But CalCarb is an unusualNordic Pure Custom MERV 8 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