11_1/2x11_1/2x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack Synthetic Pro Edition AO 36/40 plugs fit well

AO 36/40 plugs fit well into the hole sizes provided by the blocks

Anden Humidifiers are designed with easy access for simple canister changes

High cation exchange capacity (CEC)

and fungus gnats

11_1/2x11_1/2x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack Synthetic Pro Edition AO 36/40 plugs fit wellNordic 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