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33″ is tight. Many brands today are 30-32″ deep. Brands ask for 3″ behind for clearance, but you can put them really tight to the wall. The trick is to use right-angled washer hoses, and the dryer duct needs to line up right behind it. You can use 33″, but the installer needs to spec the hookups in a smart spot. I am at 34″, and I got mine to fit with 31″ deep machines. Tight but doable! all in the hookups.