12_3/4x21x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack veg-and-bloom and quiet mixed flow impeller

and quiet mixed flow impeller

Spider Mites (Tetranychidae) and other soft bodied insects

Perlite #3 can be used as a stand-alone medium in drip systems or as a mix-in element with other growth mediums

activators or catalysts to produce synchronized and accelerated growth under all conditions

The slim design minimizes sun interference while providing greater access to the plant canopy

12_3/4x21x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack veg-and-bloom and quiet mixed flow impellerNordic 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