12_3/4x20_3/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Grow System/ Trays/ Reservoirs sticker or extender

sticker or extender

Derived From: Soft rock phosphate

Light Penetration

Effective against most common pathogens and algae

LTL Controls CO2 Generators come with everything you need to get your CO2 system started

12_3/4x20_3/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Grow System/ Trays/ Reservoirs sticker or extenderNordic 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