I've been researching how to vent my basement dryer, using galvanized steel ducts. There are lots of things on Google that show how to do this under a normal situation, but mine is unique, and I can't find a good answer yet.
Normally one would drill a hole through the wall that faces the outdoors, and run the duct through there. But I can't because my walls to my house are stone, and I would never want to drill a 4 1/4" hole through it.
Instead, I'd like to dig a hole in the yard, where the vent will come through the basement cinder block, and then drill through the underground cinder block. This requires three 90 degree turns, but the total equation is less than 25' (counting 5' for each turn).
Is this ok (I follow Maryland code)? Will the weight of the dirt harm the steel duct when I refill the ground around the vertical duct? And which kind of cap should I use at the end (assuming this is ok to do in the first place)?