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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. Automatic bleeding valve - Wikipedia

    en.wikipedia.org/wiki/Automatic_bleeding_valve

    As these need to operate in any orientation, they use a different mechanism rather than a float. The hygroscopic vent system uses hygroscopic cellulose fibre discs. [7] These are small discs of material that expand when wet and shrink if warm and dry. A dry valve acts as an air vent until a dribble of water passes through it and swells the ...

  4. Passive ventilation - Wikipedia

    en.wikipedia.org/wiki/Passive_ventilation

    Both supply and exhaust happened through an unconditioned attic space, with exhaust air being extracted at ceiling height and air being supplied at floor level through a vertical duct. The device was found to provide sufficient ventilation air flow for a single family home and heat recovery with an efficiency around 40%.

  5. Condensate pump - Wikipedia

    en.wikipedia.org/wiki/Condensate_pump

    The output of small condensate pumps is usually routed to a sewer, plumbing drain, or the outside world via PVC plastic tubing (condensate drain line). In some locales, condensate water is not permitted to enter a sewer system and must be directed to the outside of the house, usually into the leader/gutter downspout system, or the stormwater ...

  6. Central heating - Wikipedia

    en.wikipedia.org/wiki/Central_heating

    Sealed systems offer an alternative to open-vent systems, in which steam can escape from the system, and gets replaced from the building's water supply via a feed and central storage system. Heating systems in the United Kingdom and in other parts of Europe commonly combine the needs of space heating with domestic hot-water heating.

  7. Fan coil unit - Wikipedia

    en.wikipedia.org/wiki/Fan_coil_unit

    The fan coil unit will contain a purpose designed drip tray with drain connection for this purpose. The simplest means to drain the condensate from multiple fan coil units will be by a network of pipework laid to falls to a suitable point. Alternatively a condensate pump may be employed where space for such gravity pipework is limited.

  8. FarmVille 2 Furnace: Everything you need to know - AOL

    www.aol.com/news/2012-11-12-farmville-2-furnace...

    After the Furnace is built, you'll be able to collect from it once per day to earn 10 free Power. That's a lower rate of return than Wells, which are ready every four hours, but I suppose some ...

  9. Furnace (central heating) - Wikipedia

    en.wikipedia.org/wiki/Furnace_(central_heating)

    A condensing gas furnace includes a sealed combustion area, combustion draft inducer and a secondary heat exchanger. The primary gain in efficiency for a condensing gas furnace, as compared to a mid-efficiency forced-air or forced-draft furnace, is the capture of latent heat from the exhaust gases in the secondary heat exchanger.

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