Originally Posted by perdick
I am confused. My understanding is that the smoke detector is on the ceiling and the CO/and or propane is down at floor level.
Propane - heavier than air - so detector close to the floor not too far away from all the propane appliances.
BTW Propane detectors typically draw 100mA so not generally battery powered. Powered by coach batteries and sometime wired to disconnect the propane supply at the tank.
Smoke usually rises, so mount detector on the ceiling or high on the wall, but NOT within 8" of the wall-ceiling corner or near cupboards, doors and windows.. One outside the bedroom and one inside is ideal. Photoelectric type best for kitchen (but not close to stove)
CO (almost the same density as air) (as distinct from CO2 which is heavier) generally as for smoke detector in living rooms, but for extra protection, could put an extra one half-way down the wall above the head of the bed. CO poisoning can occur when generator exhaust fumes even from adjacent vehicles enter the coach.
CO doesn't stratify like propane or CO2 down low, or like smoke up high, but mixes with the air fairly quickly. However, since it is a product of combustion, it is first likely to rise towards the ceiling just as smoke does.
OR read the instructions that come with the detector (but need to make allowance for special conditions pertaining to RVs).
Always confusion between CO (product of incomplete combustion) and CO2 (which we breath out and is a normal component of fresh air), both of which are lethal in some conditions. CO2 is easily reversed by breathing fresh air (old (cruel) demonstrations where a mouse keels over when dropped into a gas jar full of CO2, but comes to life immediately when taken out.)
CO poisoning is VERY difficult to reverse because it binds to haemoglobin in preference to oxygen so once that happens, even giving pure oxygen does very little good and even small concentrations breathed over a long time can cause death.
Both CO and CO2 are essentially colourless and odourless and for a time anyway, symptom-free.