The new chimney breach could send exhaust fumes out through this one, and it must be properly sealed by a licensed heating contractor to avoid pumping carbon monoxide gasses into the basement.

Also, the old sealant may contain asbestos that can also be issue if you breathe in the dust when disturbing/discarding it.

So don’t be ridiculous, call Meticulous!

See my 160 plus 5 star Google reviews, and Angi, Yelp and FB. Available 7 days, in business since 2005, licensed and insured, and I have background in construction (plumbing, roofing, electrical, foundation repair,  doors/windows, tile, kitchens and bathrooms, staircases/railings, etc.)

On the web at www.meticuloushomeinspection.com  Phone 631 902 6761