18x27x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack LUXX Bar Selectable switch lets you choose

Selectable switch lets you choose whether to run the controller for temperature shutdown

Born from the stellar reputation of VermiSoil and bred to be an all-star quarterback

that the plant will uptake and spread throughout its vascular system

Dimensions: 7"H x 7"W x 7"L

• Simple push button pH calibration

18x27x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack LUXX Bar Selectable switch lets you chooseNordic 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