11x32_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack ventilation/air-conditioning With two independent control groups

With two independent control groups (A/B)

and greenhouse roses

This translates to healthier

They combine premium grade specular aluminum with energy-efficient/high-output T5 tubes and put out double the light energy of normal fluorescent systems

11x32_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack ventilation/air-conditioning With two independent control groupsNordic 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