This has been a topic covered on several other boards and if you haven't seen any of them, I'd like to bring to light some of the issues at stake.
I've seen posted statements by hothead/bulk tank users like the following:
I'm in a 2nd story studio and am keeping the tank (either inside or out on the balcony).
I run my fuel line through a pvc pipe in the wall.
I run my fuel line through the (door/window).
I keep my tank right next to me in the studio
As I see it, I personally believe that using a bulk tank with a Hot Head or Fireworks torch is a Very Bad Idea. These torches are designed to use full tank pressure, which is anywhere from 90 to 110 PSI. There is no regulator anywhere inline, except for a tiny orifice to "spray" the propane/MAPP gas into the mixing/combustion chamber of the torch.
First of all, penetrating the wall of a residence with fuel gas pressures in excess of 5 PSI is illegal (20 PSI I think is legal for licensed commercial/industrial facilities, but correct me if I'm wrong).
Running rubber hose through a pvc pipe through the wall or door or window is illegal.
Running a hose through a door or window is still penetrating the wall.
Keeping a bulk tank inside is illegal.
Keeping a bulk tank on an outside balcony is illegal.
The only safe and legal way to operate a Hot Head/Fireworks torch is by using one pound cannisters. The use of bulk tanks with these torches is a practice which must stop before there is a tragic accident.
The bulk tank adapters and hoses that many people use are designed for outside use with things like camp stoves. Let me repeat that: designed for outside use.
Please consider the fact that a bulk tank will empty out in minutes, filling the average sized room with perhaps 100 times the explosive threshold of propane before it could be stopped.
I ask that the ISGB step up to the plate and somehow "endorse" these items. Perhaps then this unsafe method of operating these torches can come to an end.
These are my personal opinions and statements, and may not reflect those of the ISGB.