10x36x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack Grow System/ Trays/ Reservoirs Professionally designed for high frequency

Professionally designed for high frequency systems

The fans can also be set to run continuously or be turned off

the opaque black inner layer blocks all light which prevents algae buildup in the tubing and helps to keep your system clean

are one of the most effective agents for loosening and aerating the soil

• Lightweight

10x36x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack Grow System/ Trays/ Reservoirs Professionally designed for high frequencyNordic 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