Hello to everybody on the forum .I have a question that hopefully one of you can give me an answer .I need to fit a fire door at the bottom of my staicase , which leads to the loft extension ,no size is stipulated on the building regs plans .The width of the stairwell is thirty three inches , one side being load bearing , plaster finished ,original brickwork .The other being stud partition with half inch plasterboard .What width fire door would you suggest to fit into the stairwell , taking into account door casing width and architrave .Thanks in anticipation of any usefull replies , Mike