Another dryer vent question
New construction, zone 2, 10 miles from Gulf Coast. Trying to decide how to vent the gas dryer. The house has a three feet tall (to bottom of floor joists) unvented crawl space on top of a concrete slab, with CMU block walls for the perimeter stem walls enclosing the entire unvented crawl space. As the picture shows, the front porch also has crawl space, but it is vented. There is a block wall between the unvented and vented crawl space, with an access “door” to get from the unvented space to the vented porch crawl space.
One easy way to vent the dryer would be to drop down thru the floor into the crawl space, then go parallel with the floor joists and thru the block wall between the house crawl space and porch crawl space, then terminate it the porch crawl space. I know one downside of doing this is that to clean the duct well, someone has to go into the porch crawl space. Any other reasons not to terminate the duct in the porch crawl space? Will it cause a detrimental moisture build up in the vented porch crawl space? All of the framing lumber for the porch is treated. Porch floor will be a composite.
I could also have the duct make a left turn before it gets to the porch crawl space wall, then terminate it outside the crawl space, but that would “expose” the vent cap, etc. This would also require the duct to go thru the CMU block wall and the exterior brick veneer.
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