ning
Elite Member
in another thread story posted of neighbor in New England who had whole house generac put in,
installer aimed exhaust in direction of Bilco door, CO count in house 250.
CO sinks I believe so I guess it could go down the steps.
one more thing to remember, don't exhaust near basement steps.
CO is actually slightly lighter than air (0.967 the density of air). As such in a static space the CO will rise, but it doesn't take much movement at all to keep them mixed.
Being aimed at a bilco door wouldn't matter unless there was poor sealing and a negative pressure behind it.
Air = ~79% N₂ + ~1% CO₂ + ~20% O₂
Roughly speaking, C=12, N=14, O=16 and for gasses you can pretty much compare the atomic weights; in this case air ~28.96 vs CO ~28.
Propane on the other hand is C₃H₈ = ~44 which is significantly heavier than air.
Radon gas is 222, super dense!
(all the above are rough numbers and the relative densities assume the comparison is performed at the same pressure and temperature; STP for example.)