Furnaces need to be cleaned and serviced.
After a furnace is 5 years old it is considered good practice to have them serviced every year.
In spite of the fact that the furnace in the following picture had not been serviced for quite some time it is “relatively” clean. Visible in the picture is the remains of the furnace filter that has been sucked into the blower. All that remains is the cardboard frame marked “16x20x1.” I did a previously post about this called, Why is there a squirrel in my furnace? Time to get your furnace serviced.
One can also see the return air duct entering the furnace compartment at the left—just the other side of the ruined filter—-it is relatively clean looking.
The return duct in this next picture is not so clean looking. The view is looking straight down, eight feet, from the living room floor.
From this view I know I am in for a “treat” inside the furnace compartment. This next picture is looking inside the furnace compartment and there is no filter in sight. All air in the home circulates through this mess and back into the house.
At this point your lungs are filtering the air.
Charles Buell, Seattle Home Inspector
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