8_1/2x30x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack -power-&-lamp-cords - Provides automatic differential for

- Provides automatic differential for precise CO2 concentration control

and powerful airflow output is required

Used with all AeroFlo systems

When your plants enter the bloom phase

8_1/2x30x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack -power-&-lamp-cords - Provides automatic differential forNordic 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