My vent rises vertically about 5 ft from the dryer. I am trying to decide if it will considerably save drying time if I move it to only about a foot above from the dryer exhaust is, as the space both inside and outside the wall is available.
I would invest in it only if the time and energy savings from 5 to 1 ft vertical are significant. I suspect that vertical retains moisture.
The dryer is already pretty fast because it is gas heated, about half the time of the electrical dryer in another unit I own.