The rope which is found around the inside of your woodburning stove door and under its glass is ok until it burns away, gets hard or falls out! The gaps around the door and under the glass get bigger from where the rope seal has deteriorated, then the fire will start to suck air in and create a furnace, thus making the stove uncontrollable and over firing the stove which can cause damage to the stove and possibly create a chimney fire. On a boiler stove, it can also split the boiler and pipework! That’s why its OK to leave for a short period of time but depending on how often you use the fire and what temperature it is reaching it's not advised to leave it too long!
