The new dryer doesn’t have much to clamp to, so it’s always coming loose. The back of the dryer is slightly recessed where the vent is so it’s hard to get a clamp to hold and get a nut driver in there. Add to the fact that the vent exiting the house is isn’t in line and requires several bends. I like to use 4” aluminum pipe but all the elbows are a pain and the weight makes it difficult to get lined up and stay in place. I’m not a fan of the flexible foil but maybe that’s the way to go here?