15x19x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack ac-dehumidification-humidification The insulated damper uses gravity-fed

The insulated damper uses gravity-fed shutters that close the opening when the whole house fan is not in use

HIGHLY-CONCENTRATED FORMULA: With a concentration of 900 propagules per gram

hand-trimmed quality is easily achieved

This system comes with the initial water analysis package

These high quality filters will provide your plants with the clean air they require by filtering out mold and other particles that could affect or destroy your plants

15x19x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack ac-dehumidification-humidification The insulated damper uses gravity-fedNordic Pure Custom MERV 10 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