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2. Drain-waste-vent system - Wikipedia

   en.wikipedia.org/wiki/Drain-waste-vent_system

   A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.

3. Dehumidifier - Wikipedia

   en.wikipedia.org/wiki/Dehumidifier

   A typical "portable" dehumidifier can be moved about on built-in casters. A dehumidifier is an air conditioning device which reduces and maintains the level of humidity in the air. [1] This is done usually for health or thermal comfort reasons or to eliminate musty odor and to prevent the growth of mildew by extracting water from the air. It ...

4. Washing machine - Wikipedia

   en.wikipedia.org/wiki/Washing_machine

   Manufacturers have devised several ways to control the motion of the agitator during the wash and rinse separately from the high-speed rotation of the drum required for the spin cycle. While a top-loading washing machine could use a universal motor or DC brushless motor, it is conventional for top-loading washing machines to use more expensive ...

5. Downspout - Wikipedia

   en.wikipedia.org/wiki/Downspout

   This may be a simple bend of, typically around 70 degrees, at the bottom. Alternatively a downspout may lead to a sewer, a runoff water drain or a seepway to allow the water to soak into the ground through seepage. Decorative heads are sometimes added, these being low-height gargoyles.

6. Flue-gas condensation - Wikipedia

   en.wikipedia.org/wiki/Flue-gas_condensation

   Flue gas condensation may cause the heat recovered to exceed the Lower Heating Value of the input fuel, and thus an efficiency greater than 100%. Since historically most combustion processes have not condensed the fuel, usual efficiency calculations assume the combustion products are not condensed.