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Flat washers may be used on either the bolt side, the nut side or both sides of the fastener. Flat washers help to distribute the force of tightening the nut by increasing the surface area. They may also be useful as spacers when a bolt may be a bit too long for the job. Lock washers are typically used on the nut side of the fastener. The most common type of lock washer is the split coil washer.
A washer dryer combo takes up the space of just one of these. There are two types of all-in-one washer-dryer combos -- vented and ventless. We have a vented version that we sell mostly to our marine and RV markets, but our ventless version is the one that is most common for use in high-rise apartments and condos, that type of thing, says Lee. A vented unit basically works like a regular front-loading washer and a regular dryer. The wash cycle includes tumbling the clothes with water and soap until they're clean, then spinning them to help remove some of the excess water [source: LG Electronics].