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  2. Chimney - Wikipedia

    en.wikipedia.org/wiki/Chimney

    Class A are either an insulated, double wall stainless steel pipe or triple wall, air-insulated pipe often known by its genericized trade name Metalbestos. Class B are uninsulated double wall pipes often called B-vent, and are only used to vent non-condensing gas appliances. These may have an aluminum inside layer and galvanized steel outside ...

  3. Double-walled pipe - Wikipedia

    en.wikipedia.org/wiki/Double-walled_pipe

    It is a pipe within a pipe, or encased in an outer covering, with an annulus (interstitial space) between the two diameters. The inner pipe is the primary or carrier pipe and the outer pipe is called the secondary or containment pipe. The great majority of double-walled piping applications involve wastewater, groundwater, and process safety. [1]

  4. Nominal Pipe Size - Wikipedia

    en.wikipedia.org/wiki/Nominal_Pipe_Size

    Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [1] " Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside ...

  5. Stove - Wikipedia

    en.wikipedia.org/wiki/Stove

    Since they are highly efficient, they don't need a chimney; instead, they can be vented outdoors by a four-inch (102 mm) pipe through an outside wall and so can be located in any room in the home." [28] A pellet stove is a type of clean-burning stove that uses small, biological fuel pellets which are renewable and very clean-burning. Home ...

  6. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. Central vacuum cleaner - Wikipedia

    en.wikipedia.org/wiki/Central_vacuum_cleaner

    Compatible with standard tools and accessories — Most central vacuum hoses are compatible with a wide range of industry-standard brushes and tools used with ordinary portable vacuum cleaners. In the United States, the de facto standard size is 1 1 / 4 inch (3.175 cm) inside diameter for tools. For some accessories, it may be necessary to ...

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