The two ducts through the one window will work just fine if you ensure the ends of the ducts are mounted above waist high.
If you point them downward they won't look as interesting to birds looking for a nesting place.
As for the gasses pooling it is alot like having a gallon of gasoline.
Sure it could be disastrous if you don't pay attention to what you are doing ( and what others are doing).
But it is very easy to take the precautions needed and to get in the habit of double checking that you are doing what you need to stay safe.
Some folks get hard copper piping to run propane from the tank parked conveniently near the back door around the side of the house and into the basement where they have another shut off valve at the bench.
They have to wait a few seconds sometimes for the pressure at the bench to come up but it is worth the effort and the one pound bottles are only annoying if you torch for more than an hour at a time.
( The bottles can get pretty cold and some just swap one bottle for a warm one between beads when that happens).
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The Zombie Apocalypse is Upon Us.
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