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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.
Leominster (/ ˈ l ɛ m ə n s t ər / LEM-ən-stər) is a city in Worcester County, Massachusetts, United States.It is the second-largest city in Worcester County, with a population of 43,222 [3] at the 2023 census. [4]
Codes such as the UMC and IMC do include much detail on installation requirements, however. Other useful reference materials include items from SMACNA, ACGIH, and technical trade journals. American design standards are legislated in the Uniform Mechanical Code or International Mechanical Code. In certain states, counties, or cities, either of ...
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.
The attenuator is a specialty duct accessory that typically consists of an inner perforated baffle with sound-absorptive insulation. Sound attenuators may take the place of ductwork; conversely, inline attenuators are located close to the blower and have a bellmouth profile to minimize system effects.
Industrial exhaust ducts are pipe systems that connect hoods to industrial chimneys through other components of exhaust systems like fans, collectors, etc. Ducts are low-pressure pneumatic conveyors to convey dust, particles, shavings, fumes, or chemical hazardous components from air in the vicinity to a shop floor or any other specific locations like tanks, sanding machines, or laboratory hoods.
Due to its location in Central Massachusetts, Worcester is known as the "Heart of the Commonwealth"; a heart is the official symbol of the city. However, the heart symbol may also have its provenance in lore that the Valentine's Day card, although not invented in the city, was first mass-produced and popularized by Worcester resident Esther ...
Download QR code; Print/export Download as PDF; ... ZIP code: 01462. Area code: 351 / 978: FIPS code: ... at an intersection with Rt 2a/Mass Ave near the Shirley line ...
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