Hi !!
Before removing a bathroom subfloor under a load baring wall,you should consult experienced contractor.Otherwise it will be harmfull to you.Surely he give you a great help.
____________________
General Contractor
Many paint strippers are available in the market you can use them.But be careful because they can leave adverse effects on walls.So find out best one then apply.It would be better if you will ask renovator/specialist.
For this you should take help some renovation contractor or architect. You can use some flue liner. Before taking any decision you should consult first. I don't think there would be any problem in installing but consult first.
