20x22_1/4x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack Monitors & Timers To use Hydrofarm's CO2 Flow

To use Hydrofarm's CO2 Flow Rate Calculator

the Sunburst is sure to shine

Convenient

This results in improved flavor

- Pre-mounted double ended sockets included

20x22_1/4x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack Monitors & Timers To use Hydrofarm's CO2 FlowNordic 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