Hello all! Hoping to get some help here. I bought a house a couple years back and am just no getting around to setting up a wood stove. The chimney was here all ready when I purchased my home. My question is do you need a wall thimble? The chimney outside is a Metalbestos double wall that runs straight into the house. I will include a couple photos. I really don’t want to rip it down and install a wall thimble if it’s not necessary. Any help or advice is more than welcome! Thankyou!