Check the filter monthly to see when it needs to be replaced.
Armstrong furnace filters.
Warranty armstrong air s commitment to a better product is backed by a limited lifetime warranty on the stainless steel heat exchanger and a 10 year limited warranty on parts.
Including oil gas furnaces air conditioners heat pumps package units air handlers.
If so change the filter.
Free shipping to the contiguous united states for orders over 99.
Check the furnace or air handler filter to see if it is blocked with dust and dirt.
Dispose of it and replace it with a new filter of the same size when it gets dirty.
Actual size h 19 5 8 x w 24 3 8 x d 4 3 4.
Your armstrong air furnace s electronic control system prolongs system life by continuously monitoring internal components for optimum performance and fault prevention.
Remember to change your filter approximately once a month.
Contact your armstrong air dealer if the problem persists.
Dirty or blocked ductwork.
Check your indoor unit to see or hear if the blower is running.
Armstrong filter replacement 20x25x5 merv 11 aftermarket armstrong filter armstrong air filters armstrong furnace filter for nominal size 20 x 25 x 5.