17_1/8x26_1/2x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack Promote Dimming settings are available at

Dimming settings are available at 100% 75% and 50% give you an edge on controlling heat and other environmental factors in your garden

undervoltage protection

The LCD screen clearly displays information with measurements in liters or gallons

Wide thick base

Increase porosity in growing media allowing more air flow and drainage

17_1/8x26_1/2x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack Promote Dimming settings are available atNordic 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