A:Answer Since nobody has responded, I will take a stab. I believe that what you read in the delivery description refers to actually removing the metal, circular "punch out" on the left side of your dryer so that the internal vent hose comes out of the unit on the left rather than out from the back. This is more of a DIY project that can be done but that installers don't usually perform. Your current set up is probably vented out the back of the dryer and then routed to the left (via use of an elbow) and attaches to the wall vent opening that leads outside. I have been reseaching this week and learned that most if not all installation guys only do what is called "hook up." That means plugging in, attaching new gas lines, new water lines and new rigid venting (required for gas, not electric). I think installers are pleased not to have to make any alterations to the setup and can simply install your new vent hose the exact same way the old one was. I hope I did not confuse you.