Laundry lockers are used in places like hospitals and food-processing workplaces where uniforms have to be collected, laundered, then returned to their owners. The locker cabinet contains a number of very narrow lockers, each of whose doors is keyed using a key held by the owner, so that they have access only to their own locker; but the entire array of doors is embedded in a much larger door covering the entire front of the cabinet. Opening this opens all the lockers simultaneously, and requires the use of a master key which is held by whoever collects items deposited in lockers, for laundering, then returned in the same way, after which they items are accessible to owners using their individual small doors.
Bank size: It does not necessarily refer to the total number of compartments, but rather the number of compartments wide the entire cabinet is. So a bank of three may contain six lockers, for example, if they are two-tier lockers. In short, the total number of lockers is the bank size multiplied by the number of tiers. Sometimes the term "bay" is used instead of "bank", although "bank" appears to be the more standard term; on other occasions, "bay" refers to a single locker width within a bank, including all tiers of locker directly on top of each other.
There is a luggage storage service a short one minute walk from Union Station in downtown Denver - LUGDEN. You can make a reservation online - lugden.com, call - (303) 747-5600, or show up as a walk-in. They offer hourly, day, overnight and weekly bag storage. Great place to store your luggage if you're on a layover from Denver International Airport, or going to a concert, or headed to a Rockies game at Coors field and want to enjoy yourself without having to lug your bags around.