28x36x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack timers-and-instruments Multi-aspect protection circuitry: Includes short

Multi-aspect protection circuitry: Includes short circuit protection

Hanging loops at top and bottom so you can flip entire unit for faster drying

fuller flower growth with higher quality yields

Grow Spray is extremely effective and is safe to use with other nutrients

How often should I apply it

28x36x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack timers-and-instruments Multi-aspect protection circuitry: Includes shortNordic 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