During some home-improvement, we need put in some new dryer venting. The most aesthetically pleasing option is to have a 90deg turn out of the dryer, then into a 3" pipe that goes for 9 feet. There is another option that would have a 90 degree turn, vertical for 4 feet, another 90 degree turn and then 9 feet out through a 4" pipe.
We have received different advice from different technicians, some who say that the 3" pipe isn't a problem, and that it is preferable since it avoids the second right angle and the vertical distance. A different technician told us that going through a 3" pipe is definitely not good, and even though it is more corners and distance, the second option is preferable (still under 25 feet of piping, even taking corners into account).
The main question is on the impact of a 3" pipe. Should this be avoided at all costs, and if put in there is a good chance that it will lead to dryer damage/reduced lifespan? Or is it manageable, and worth the tradeoff for shorter overall exhaust pipes?