9_3/4x23_3/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack misc You can also build your

You can also build your own system from the ground up by purchasing all the components individually

and start with an anodised base coat which gives a hard support to minimize abrasion damage

The two part system allows for versatility and efficient use of space

it increases nutrient value

Why does FoxFarm call it Big & Chunky

9_3/4x23_3/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack misc You can also build yourNordic Pure Custom MERV 13 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