13_1/4x13_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack AIR FILTER BOXES Registered for Organic Agriculture by

Registered for Organic Agriculture by the Washington State Dept

Perfecta BASE is used in each stage of the growing process

vegetative

Even light distribution

Add last to reservoir

13_1/4x13_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack AIR FILTER BOXES Registered for Organic Agriculture byNordic 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