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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. How to Fix Your Frozen Pipes, According to Experts - AOL

   www.aol.com/keep-pipes-freezing-winter-according...

   If your pipes are exposed, we recommend using a hair dryer, heating pad, or space heater to help thaw your pipes and get water moving again. (Note: Never leave the latter two methods unsupervised.)

4. Gooseneck (piping) - Wikipedia

   en.wikipedia.org/wiki/Gooseneck_(piping)

   Gooseneck vent with check valve being repainted. A gooseneck (or goose neck) is a 180° pipe fitting at the top of a vertical pipe that prevents entry of water. Common implementations of goosenecks are ventilator piping or ducting for bathroom and kitchen exhaust fans, ship holds, landfill methane vent pipes, or any other piping implementation exposed to the weather where water ingress would ...

5. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Rooftop HVAC unit with view of fresh-air intake vent Ventilation duct with outlet diffuser vent. These are installed throughout a building to move air in or out of rooms. In the middle is a damper to open and close the vent to allow more or less air to enter the space. The control circuit in a household HVAC installation.

6. The Sealegend Dryer Vent Cleaner Kit is on sale at Amazon - AOL

   www.aol.com/lifestyle/sealegend-dryer-vent...

   Save money and energy with this dryer vent-cleaning kit loved by over 14,000 shoppers.

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.