DO NOT PLACE PROPANE SENSOR HIGH UP ON CEILING IT WILL TELL YOU NOTHING! A VERY DANGEROUS THING TO DO!!!!
Propane /Lpg is heavier than air so will sink into the bilge
follow this advice as:
The fume detector - The panel should also be fitted with a fume detector test switch and alarm
. The sensor (s) themselves should be mounted directly under
the appliance. Many install the sensor in the bilge
. If the fumes reach the bilge .... it's too late.
Cheers Steve (IIMS Surveyor)