A clothes dryer, tumble dryer, or drying machine is a household applianceViking Appliance Repair in Los Angeles All Repairs for Viking Appliances. Read more ... » that is used to remove moisture from a load of clothing and other textiles, generally shortly after they are cleaned in a washing machine.
Most dryers consist of a rotating drum called a tumbler through which heated air is circulated to evaporate the moisture from the load. The tumbler is rotated to maintain space between the articles in the load.
Using these machines may cause clothes to shrink, become less soft (due to loss of short soft fibers/lint). For these reasons, as well as to save energy, many people use open air methods such as a clothes line and clotheshorse.
Traditional dryers continuously draw in the cool, dry, ambient air around them and heat it before passing it through the tumbler. The resulting hot, humid air is usually vented outside to make room for more dry air to continue the drying process. This design makes no effort to recycle the heat put into the load, and thus is considered environmentally detrimental. Nevertheless, this design is simple, reliable, and cheap, and widely used as a result.
Improvised methods of salvaging this heat for in-home heating, by use of inline vent boxes equipped with a flapper valve to direct heat to indoor areas, will increase humidity within a dwelling. Humidity from these devices increases likelihood of mold, mildew, and bacterial growth inside a home. Indoor venting may also be against local regulations. Gas dryers must be vented outdoors, as the products of combustion are vented along with the moist air. Building codes and manufacturers’ instructions recommended that dryers vent outdoors. An indoor lint trap kit poses a similar concern of increased humidity within the dwelling. ‘Long run’ dryers have an additional fan inside to boost the exiting moist air through longer sections of vent pipe, as in apartments or dwellings where the vent cannot make a direct connection from the dryer to the outside.