20x23x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack -power-&-lamp-cords The Pro 650 system raises

The Pro 650 system raises the PAR bar for the entire horticultural lighting industry

No guesswork as to how much or when to water

The mixture is fortified with fossilized kelp and inoculated with endo and ectomycorrhizae

Designed for ventilation applications including HVAC

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20x23x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack -power-&-lamp-cords The Pro 650 system raisesNordic Pure Custom MERV 10 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