hi there i am looking to install a woodburner in an old chimney i have reopened.my first question is the opening is 40 inches wide of which i want to reduce by 4 inches each side with a concrete lintel accross the top of the opening just to tidy it up. brick work is fine its the old red clay bricks,now what type of brick do i use to reduce the width can i use any type of brick due to the heat also what type or mix of mortar,this is my first question i think i am going to get on your nerves in the next few weeks but many thanks in advance
DEAN
DEAN