28x34x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack spl_hi Protect your crops the way

Protect your crops the way nature intended

Smart gardeners know that soil is anything but an inert substance

so you achieve maximum results

Displays ambient CO2 level

Designed specifically for the horticulture industry

28x34x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack spl_hi Protect your crops the wayNordic Pure Custom MERV 14 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