Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
what is it? where does it go?
I opened up the fire door to my Utica sfh-3100s and found this rectangle piece of foam insulation sitting there loose. Not sure how it should be situated. The picture is taken right at the mouth of the fire door.