12_3/4x21x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack house and amp they shrink to about 25%-30%

they shrink to about 25%-30% in size of what they once were

and 100-125V AC wall adapter

200 square feet

Growers choose the GROW1 KDF-85 because it delivers consistent filtration performance across a wide range of water temperatures and flow rates — making it equally effective for cold-water drip systems and warm greenhouse environments

12_3/4x21x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack house and amp they shrink to about 25%-30%Nordic Pure Custom MERV 7 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