Quote Originally Posted by copobo
Medical Pot House Explodes, Two Burned - Denver News Story - KMGH Denver
A local fire marshal warned that using butane to extract the active ingredient THC from marijuana should never have been attempted inside the home. Four empty cases of butane fuel canisters were found in the home.

??When butane is used indoors, severe injury or death may result,? explained Fire Marshal Jay Nelson of the Red White and Blue Fire Department.
Four empty cases is a lot to run indoors! Never, ever, ever run a butane extraction indoors. A pilot light or a spark contacting those fumes will cause instant detonation and wall-to-wall inferno.