Should have changed the filter more than every 5 years.
Did it work?
In the interest of self preservation I didn’t try to fire her up. But the sellers claim it worked 2 months ago. :roll:
Was the seller into woodworking?
It looks like fine saw dust particles.
But of course that’s just a guess.
Either way it needs a good cleaning and maintenance check. LOL
Does conditioned air really flow through this part of the furnace? Or just combustion air? Looks to me like the access cover is missing and like Rich said it is fine sawdust. You can see more of it to the left on the gas pipe insulation.