23_1/2x23_1/2x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack hydro-components Key Features: Chelated Manganese

Key Features: Chelated Manganese

Improves drought tolerance

or any loose growing media like peat

Two square obeservation windows on the front door

23_1/2x23_1/2x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack hydro-components Key Features: Chelated ManganeseNordic 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