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2. 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. [1] [2]

3. PAC International - Wikipedia

   en.wikipedia.org/wiki/PAC_International

   PAC International, Inc. is a privately held corporation that began over 20 years ago. The company is now headquartered in Oregon. [6]PAC International is a company that strives to “give back” to society by exemplifying social responsibility practices, including manufacturing products in the United States and having RSIC-1 products assembled within the local community.

4. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Central, "all-air" air-conditioning systems (or package systems) with a combined outdoor condenser/evaporator unit are often installed in North American residences, offices, and public buildings, but are difficult to retrofit (install in a building that was not designed to receive it) because of the bulky air ducts required. [32] (Minisplit ...

5. List of polyurethane applications - Wikipedia

   en.wikipedia.org/wiki/List_of_polyurethane...

   Industrial Insulation. Rigid polyurethane foam is used in various industries to provide thermal insulation to installations and pipes. In particular, the piping for district heating systems in Europe is primarily insulated using a pre-insulated pipes sandwich assembly composed of a steel heat service pipe, an insulating layer (polyurethane foam) and a polyethylene (PE) casing, which are bonded ...

6. Building insulation material - Wikipedia

   en.wikipedia.org/wiki/Building_insulation_material

   Fiberglass fibers are bound into batts using adhesive binders, which can contain adhesives that can slowly release formaldehyde over many years. [37] The industry is mitigating this issue by switching to binder materials not containing formaldehyde; some manufacturers offer agriculturally based binder resins made from soybean oil.

7. Strut channel - Wikipedia

   en.wikipedia.org/wiki/Strut_channel

   Strut is normally made of sheet steel, with a zinc coating (), paint, epoxy, powder coat, or other finish.. Strut channel is also manufactured from stainless steel for use where rusting might become a problem (e.g., outdoors, facilities with corrosive materials), from aluminium alloy when weight is an issue or from fiberglass for very corrosive environments.