13x21_3/4x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack New-releases Ideal For Growers Who:

Ideal For Growers Who:

Visible results can be seen within days of application

healthy stems

Motor with thermal overload protection

The Model AS80LC should not be used with softened water

13x21_3/4x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack New-releases Ideal For Growers Who:Nordic 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