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Isn't there a big fire/explosion risk as these are very flammable?

Most RV's use this combo for the fridge. They don't seem to explode but there does seem to be a number of fires.

Well, RV fridges are burning propane to heat ammonia (so it can function when electricity is not available).

This is not the same as actually replacing the refrigerant with propane (or a propane/isobutane blend). Still seems less risky then a gas dryer.

RV fridges burn the propane not compress it.