I finally put my gas bottle burner in today only to find I can't get a lot of draw ,if I leave the door open the fire draws like mad but if I close it after about 5 minutes the fire dies I have a air intake just under the door at the base of the fire which is one inch sqaure .the bottle is a 13 litre one with a 4 1/2 flue should I put another air intake in if so were would be the best place to put it ,I'll put some photos of it up tomorrow to show you all