17_1/2x21x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack rockwool Use the 220 micron to

Use the 220 micron to get more pollen

but it also provides environmental control without the need of any addition controllers

Strap in and light the fuse

and is an ideal choice for developing starts into vigorous

For proper function the Ice Box must be installed on the exiting air duct flange

17_1/2x21x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack rockwool Use the 220 micron toNordic Pure Custom MERV 14 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