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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. [1] [2]
The adhesive on so called duct tape dries and releases with time. A more common type of duct sealant is a water-based paste that is brushed or sometimes sprayed on the seams when the duct is built. Building codes and UL standards call for special fire-resistant tapes, often with foil backings and long lasting adhesives.
Pressurisation ductwork (sheet metal) externally fireproofed with pressed vermiculite boards, stapled together. Pressurisation ductwork made of Durasteel. Pressurisation ductwork is a passive fire protection system. It is used to supply fresh air to any area of refuge, designated emergency evacuation or egress route.
The following is a list of school districts that serve the city of Phoenix, Arizona.. Many separate independent school districts serve Phoenix. This is a legacy of the city expanding through annexation of bordering territory; many of the school districts were in existence prior to their territories becoming part of the city.
Campus in Phoenix. The church was founded in 1923 under the name of Phoenix First Assembly. [1] In 1979, Tommy Barnett became the senior pastor. [2] In 2011, his son Luke Barnett became the senior pastor. [3]
The Arizona State Capitol in Phoenix (2021). Members of the Arizona Legislature are elected from 30 districts, each of which elect one senator and two representatives.Members of both chambers serve two-year terms.
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