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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 ...
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 ...
Spray foam insulation or spray polyurethane foam (SPF) is an alternative to traditional building insulation such as fiberglass. A two-component mixture composed of isocyanate and polyol resin comes together at the tip of a gun, and forms an expanding foam that is sprayed onto roof tiles, concrete slabs, into wall cavities, or through holes ...
It is the most common polymeric insulation material. The acronym XLPE is commonly used to denote cross-linked polyethylene insulation. XLPE automotive duct; Automotive ducts and housings: PEX also referred to as XLPE is widely used in the aftermarket automotive industry for cold air intake systems and filter housings. Its properties include ...
Duct insulation; specialty steels, such as COR-10 steels or A304 SS or A316L SS, Duct internal coatings. Duct internal coatings are expensive, and may cost more than the stack plate they protect. Uncoated stacks cement plant stacks, with condensation, have been noted to last less than two years.
Air is circulated through ductwork, which may be made of sheet metal or plastic "flex" duct, and is insulated or uninsulated. Unless the ducts and plenum have been sealed using mastic or foil duct tape, the ductwork is likely to have a high leakage of conditioned air, possibly into unconditioned spaces. Another cause of wasted energy is the ...