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2. 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]

3. 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 ...

4. Fireplace - Wikipedia

   en.wikipedia.org/wiki/Fireplace

   Metal-lined flue: Double- or triple-walled metal pipe running up inside a new or existing wood-framed or masonry chase. Newly constructed flues may feature a chase cover, a cap, and a spark arrestor at the top to keep small animals out and to prevent sparks from being broadcast into the atmosphere. All gas fireplaces require trained gas service ...

5. Duct (flow) - Wikipedia

   en.wikipedia.org/wiki/Duct_(flow)

   When necessary, a double walled duct is used. This will usually have an inner perforated liner, then a 1–2" (2.5-5 cm) layer of fiberglass insulation contained inside an outer solid pipe. Rectangular ductwork commonly is fabricated to suit by specialized metal shops. For ease of handling, it most often comes in 4' (120 cm) sections (or joints).

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   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. Franklin stove - Wikipedia

   en.wikipedia.org/wiki/Franklin_stove

   A Franklin stove. The Franklin stove is a metal-lined fireplace named after Benjamin Franklin, who invented it in 1742. [1] It had a hollow baffle near the rear (to transfer more heat from the fire to a room's air) and relied on an "inverted siphon" to draw the fire's hot fumes around the baffle. [2]