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2. Duct (flow) - Wikipedia

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

   It is commonly attached with long zip ties or metal band claps. However, the pressure loss is higher than for most other types of ducts. As such, designers and installers attempt to keep their installed lengths (runs) short, e.g. less than 15 feet (5 m) or so, and try to minimize turns. Kinks in flexible ducting must be avoided.

3. Hookstown, Pennsylvania - Wikipedia

   en.wikipedia.org/wiki/Hookstown,_Pennsylvania

   Hookstown is located in western Beaver County at (40.598869, −80.474150 [5]Pennsylvania Route 168 runs through the community, leading northeastward 3 miles (5 km) to the Ohio River borough of Shippingport and south 1.5 miles (2.4 km) to U.S. Route 30, the Lincoln Highway.

4. 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.

5. Mechanical, electrical, and plumbing - Wikipedia

   en.wikipedia.org/wiki/Mechanical,_electrical...

   Plumbing systems also service air distribution/control, and therefore contribute to the mechanical part of MEP. Plumbing for HVAC systems involves the transfer of coolant, pressurized air, water, and occasionally other substances. Ducting for air transfer may also be consider plumbing, but is generally installed by different tradespeople. [11]

6. Atmospheric duct - Wikipedia

   en.wikipedia.org/wiki/Atmospheric_duct

   Atmospheric ducting is a mode of propagation of electromagnetic radiation, usually in the lower layers of Earth’s atmosphere, where the waves are bent by atmospheric refraction. [2] In over-the-horizon radar , ducting causes part of the radiated and target-reflection energy of a radar system to be guided over distances far greater than the ...

7. Sound attenuator - Wikipedia

   en.wikipedia.org/wiki/Sound_attenuator

   A sound attenuator, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces.