12_3/4x21x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack ventilation and ducting Bloom 3'X2'

Bloom 3'X2'

When used alone as an amendment

The FloraFlex® Incubator™ System* is designed to accelerate growth through aerated convection

Trace elements

Multiple release types allows for variable uses in different growing environments

12_3/4x21x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack ventilation and ducting Bloom 3'X2'Nordic 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