Insulation around old brick fireplace

How to Insulate a Fireplace

Code Requirements for Fireplace Clearances - Fine Homebuilding

A Custom DIY Fireplace Mantel Beneath Our Shiplap - Old Town Home

Exposing Brick

Removing a traditional kitchen fireplace and hood

All About Prefabricated Fireplaces

Strip of fiberglass insulation forms a smoke and gas tight seal between a fireplace insert and the surrounding masonry. Insulation should be replaced every time an insert is removed for cleaning. Peel off backing and apply to the back of fireplace insert flange to seal space between flange and masonry surface.

Meeco's Red Devil 1105 Fireplace Insert Insulation

Can anyone tell me what the insulation around the pipe is? : r/Insulation

Providing Outdoor Combustion Air for a Wood Stove - GreenBuildingAdvisor