9x27x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack spl_hrg These ingredients pose no risk

These ingredients pose no risk of overexposure and will not aggravate respiratory conditions in most people

Available in duct diameter from 4’’ to 8’’

It’s especially useful when used in a greenhouse

Unique drainage properties deters damping off

9x27x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack spl_hrg These ingredients pose no riskNordic 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