Don't know about the Affinity dryers, but most dryers can be vented in three ways: out back (most direct route), out one or the other side, or down through the floor. The side venting can be tricky, because if it's a gas dryer it probably will have the gas burner on one side and of course you can't run an exhuast duct through a roaring gas jet. So make sure you have can vent the dryer through the side where you plan the exhaust.
Alternatively, venting through the floor saves the most room, but it also requires a basement, crawl, or utility room space under the floor, and it also makes positioning the dryer something of a chore (I have to crawl under the house to disconnect the exhaust vent if I need to move the dryer).
Lastly a periscope is certainly a viable option, but it will take up some space. Not as much as a regular exhaust duct, but an inch or two, and it probably works best if the dryer is set against an outside wall (for less twists and turns in the venting path).
Alternatively, venting through the floor saves the most room, but it also requires a basement, crawl, or utility room space under the floor, and it also makes positioning the dryer something of a chore (I have to crawl under the house to disconnect the exhaust vent if I need to move the dryer).
Lastly a periscope is certainly a viable option, but it will take up some space. Not as much as a regular exhaust duct, but an inch or two, and it probably works best if the dryer is set against an outside wall (for less twists and turns in the venting path).