Cecil:
Yes, you can run propane ones inside, but I still wouldn't recommend it. I worked at a place where all we had were propane forklifts. One week, one started running bad, and we all ended up with headaches.
I know the price of the "off name" generators that some of the big box stores carry is tempting, but for something that could make or break one to two years of work, I wouldn't chance it. I would stick to a more mainstream manufacturer, even if it was more than 2x the price of the off name ones. If the unit breaks, finding parts may be durn near impossible 5-10 years down the road.
