Product review (5 stars): Dryer vent issues finally resolved!
I didn't realize that my dryer had a bump-out on the bottom until the delivery man said that my new dryer was too deep for my tiny laundry room.  The sales rep suggested a periscope dryer vent & since I couldn't find the size I needed locally, I ordered one from Home Depot.  It came bent in a box that had no packing material so I returned it to the HD store.  In the meantime I bought a foil vent, which kept getting smashed & disconnected from the wall. I worried about the potential fire hazard, continual cleaning from the flying lint each time it disconnected, higher electric bills since the room got so hot, not to mention worrying about injuring myself whenever I had to squeeze into an extremely small space to reattach the vent almost every time I used the dryer.  Amazon came up in my google search & since I never ordered anything from Amazon that didn't have secure packaging I decided to make another attempt.  The vent came quickly & was in perfect shape.  I ordered the smaller 0-18" size but needed a HVAC tech cut it down since it slid into the 12" size that I needed, but there wasn't enough space for the extra 6" overhang.  The tech cut it down (which looked easy if you have the proper tools, which I didn't), duct taped the openings (per other online review recommendations) attached the clamps & voila.  It smelled a little the first few times I used it so I ran it for short periods for about a week.  I'm not big on writing reviews, although I like to read them, but I'm so happy & relieved with the periscope solution that I wanted to share my experience.