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2. How to Clean and Remove Stains From a Jetted Tub ... - AOL

   www.aol.com/clean-remove-stains-jetted-tub...

   Jetted tubs can easily be stained from soap scum, bath oils, bubble bath and even rusty plumbing. To get stubborn stains out, mix a paste of baking soda and hydrogen peroxide together and let it ...

3. Hypocaust - Wikipedia

   en.wikipedia.org/wiki/Hypocaust

   Hypocaust under the floor in a Roman villa in Vieux-la-Romaine, near Caen, France. A hypocaust (Latin: hypocaustum) is a system of central heating in a building that produces and circulates hot air below the floor of a room, and may also warm the walls with a series of pipes through which the hot air passes.

4. Duct (flow) - Wikipedia

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

   A duct with less than 0.75 mg/100m 2 is considered to be clean, per the NADCA standard. [7] A Hong Kong standard lists surface deposit limits of 1g/m 2 for supply and return ducts and 6g/m 2 for exhaust ducts, or a maximum deposit thickness of 60 μm in supply and return ducts, and 180 μm for exhaust ducts. [ 8 ]

5. Drain cleaner - Wikipedia

   en.wikipedia.org/wiki/Drain_cleaner

   A drain cleaner, also known as drain opener, refers to a person, device, or product used to unblock sewer pipes or clear clogged wastewater drains.This term typically applies to chemical, enzymatic, or mechanical tools such as commercial chemical cleaners, plumber’s snakes, drain augers, bio-enzyme solutions, or toilet plungers.

6. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   PTAC systems may be adapted to provide heating in cold weather, either directly by using an electric strip, gas, or other heaters, or by reversing the refrigerant flow to heat the interior and draw heat from the exterior air, converting the air conditioner into a heat pump. They may be installed in a wall opening with the help of a special ...

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   Get breaking news and the latest headlines on business, entertainment, politics, world news, tech, sports, videos and much more from AOL