15x30_5/8x1 MERV 7 AC Furnace Filters 6 Pack bio soil For hydroponic use:

For hydroponic use:

It has two 4" ports to facilitate installment to ventilation systems

High par value

Testing for phytotoxicity and compatibility is recommended before widespread use on plants or mixing with other products

Sold in a case of 32

15x30_5/8x1 MERV 7 AC Furnace Filters 6 Pack bio soil For hydroponic use:Nordic Pure MERV 7 Pleated AC Furnace Air Filters provide exceptional filtration for both home and commercial environments. Each time air passes through a Nordic Pure pleated furnace air filter, lint, dust, pollen, bacteria, pet dander, dust mites, mold spores and other contaminants are removed. MERV 7 furnace filters are comparable to HVAC filters with the rating of MPR 600. While different companies use different scales to measure the air filters