I run 3 1k closets out with the temps I talked about, same rH as you and no steam. No idea why. I too imagined that there would be a big whole in the snow near the outlet and even that doesn't happen. I guess it go up too quick.
If you had a 400cfm exhaust inside of a built closet in a basement exhausting directly outside the house and had a passive intake, could draft from the chimney be pulled and cause the gas boiler spill switch to trip or even worse potentially pull CO into the basement through a backdraft? I may be overthinking here but seems like this could cause a neg pressure in the entire house but I don’t know how much air is enough to cause this.
Yes this can happen. I do HVAC and if your appliance has a natural draft it can do what you’re saying. Any questions feel free to ask! Pics are a million words
