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Kinks in flexible ducting must be avoided. Some flexible duct markets prefer to avoid using flexible duct on the return air portions of HVAC systems, however flexible duct can tolerate moderate negative pressures. The UL181 test requires a negative pressure of 200 Pa. To use flexible ducting in a system, make sure to pull the duct tight so you ...
The Sheet Metal and Air Conditioning Contractors' National Association (SMACNA; pronounced 'Smack'-'Nah') is an international trade association with more than 4,500 contributing contractor members [1] in 103 chapters [2] throughout the United States, Canada, Australia and Brazil.
Fabricators and Manufacturers Association, International (FMA) is a nonprofit professional association serving both company and individual members in the metal processing, [1] forming, and fabricating industries. [2] Registered in the United States as a 501(c)3 organization, [3] it also has members in Canada and Mexico.
The Federation of Environmental Trade Associations (FETA) is a UK body which represents the interests of manufacturers, suppliers, installers and contractors within the refrigeration, heating, ventilating, and air conditioning industry. It is based in Hare Hatch (in the parish of Wargrave) near Wokingham.
A common cable installation technique for fiber cables remains cable pulling. After the duct is placed, a high-strength pull line is blown into the duct (if one has not already been pre-installed by the duct manufacturer). The pull line is attached to one end of the cable and is used to pull the cable through the duct.
The National Association of Manufacturers (NAM) is an advocacy group headquartered in Washington, D.C., with additional offices across the United States. It is the nation's largest manufacturing industrial trade association, representing 14,000 small and large manufacturing companies in every industrial sector and in all 50 states. [ 1 ]
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.
A duct bank is usually made of multiple PVC conduits encased in concrete. FMC or Flex is used where EMT or other non-flexible conduit is impractical or for short runs, known as "whips", to lights or other devices. For power circuits, the color-coding uses the same colors as residential construction, and adds the additional wires used for three ...
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