Last spring, I had a new furnance installed in my 20 year-old house. When the furnance began running last November, I noticed an odd odor (like a dead animal smell) coming from the vents in my kitchen. The smell is in no other room vent. The smell has gotten progressively worse as the months have gone on.
My kitchen was constructed on a slab but the rest of teh house was constructed over a basement. The furnance installer came out and checked the furnance but said the smell was not coming from the furnance. A plumber came out and said there was no evidence of the kitchen sink plumbing pipes being broken. My son has cleaned out the vents from the kitchen all the way to the furnance but has found nothing.
What could this 'dead animal' smell possibly be coming from? I am at a loss on what next steps I should take??