How often should I replace the carbon filter in my air cleaner?

The activated carbon filter must be replaced when it is no longer effective in eliminating odors. The life of the carbon filter will depend on the concentration of odors and fumes in the air passing through the air cleaner.

Under normal operating conditions, the carbon filter should last from three to six months. NOTE: the carbon filter must be in place for the air cleaner to operate.

Visit BuyFriedrich.com for more details on the C-90B or to order replacement filters online.