tuppaware

B
blocking chimneys effectively can be a problem. First I ascertain if the flue has ever been used.
if it has and there is any soot residue -then it would be foolish to do a standard depressurization test because if the temp seal or bung failed then there is a risk of soot in the living room! In this case I always turn my rig around and do a pressurization test from the outside. I have tried blowing up a baloon and putting this up a vent but there were sharp edges and it popped! I have a football and this often works in round flues. I also have a collection plastic kitchen pots of different sizes to act as bungs. This lot tend to rattle around in the back of the car so that I appear to be a demented tuppaware salesman!