8x28x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Ventilation/Air Conditioning They measure a quarter of

They measure a quarter of an inch in length and are just wicked sharp

It will help develop a thick

The clear polycarbonate cover allows full sun exposure while keeping out the cold

but it also helps your HVAC unit perform more efficiently

Dimmension:44

8x28x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Ventilation/Air Conditioning They measure a quarter ofNordic 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