First off, before I get a bunch of crap about it- I know some victims didn't jump they fell it's just easier to say jumpers. Second, R.I.P. to the victims of this horrible day.But, I want to know a few things:1. What do you think were going through their heads? (family, the fall, etc)2. Did they pass out before impact?3. What happened to the bodies on impact?
Any alteration to a listed fireplace unit will render it unsafe unless the manufacturer provides a listed conversion kit or specifications for fabricating a vent using readily available listed venting materials.. Ask your dealer if this is available. If not, only use a listed fireplace that has been installed according to the instructions that came with it.
Call your local gas company, I'll be they'll tell you.
That's enough pressure for a test. Propane only has half that amount of pressure. All joints should be looked at closely with soapy water though. I always check new installations this way just to be sure.