14_1/2x19x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack dupe CAL CHECKTM allows the user

CAL CHECKTM allows the user to easily check the pH probe calibration status at any time

Ducting Size: 10” | Length: 8 feet | Includes two stainless steel 10" duct clamps

#1 Additive on the market

Grow-Cubes do not need to be changed

14_1/2x19x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack dupe CAL CHECKTM allows the userNordic 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