- This fireplace draft blocker measures 14" x 36" and is designed with 3 sewn-in loops, allowing you to easily trim it to fit flues measuring 13" x 35" or smaller. For a secure and effective seal, make sure the fireplace damper is slightly larger than the flue opening.
Disclosure: This post may contain affiliate links which means I may receive a commission for purchases made through links. I will only recommend products that I have personally used! Learn more on my Private Policy page.
