21_1/4x23_1/4x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Reflectors & Grow Lights These reservoirs feature (3) convenient

These reservoirs feature (3) convenient portholes for various applications

Engineered to commercial standards with a 15-inch hand selected ash wood treated handle

With up to 99% bacterial filtration

creating lateral growth and a strong foundation

21_1/4x23_1/4x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Reflectors & Grow Lights These reservoirs feature (3) convenientNordic 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