17x27x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack ventilation/air-conditioning Their bright color makes them

Their bright color makes them easy to locate

The Pro 325 system is engineered for commercial greenhouses and controlled environment agriculture (CEA) environments

• Ideal for cultivation with high light demands

Elite 91 FLOWERS contains a carefully calibrated balance of phosphates

Runs on a 400W HPS ballast

17x27x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack ventilation/air-conditioning Their bright color makes themNordic 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