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Low velocity systems diffuse air through the fabric surface or through micro perforations in the fabric, while higher velocity mixing systems use laser cut perforations or textile nozzles to throw the air. Ducts can be made in various shapes, including half-rounds (d shape), quarter-rounds, circle sections, ovals, and rectangles.
Duck fabric is woven with two yarns together in the warp and a single yarn in the weft. By treating with wax, duck fabric can be made waterproof (see waxed cotton). Cotton duck strips were the origin of duck tape, recorded in the Oxford English Dictionary as having been in use since 1899 [3] (see duct tape).
Fabric ducts are available in various colors, with options for silk screening or other forms of decoration, or in porous (air-permeable) and non-porous fabric. The determination which fabric is appropriate (i.e. air-permeable or not) can be made by considering if the application would require an insulated metal duct.
Kids these days aren't just making wallets out of duct tape — they're crafting three-piece suits and ballgowns from the stuff. New York teens create wild prom outfits with funky fabric — duct ...
Wheel fender extension to keep down lunar dust improvised using duct tape during the Apollo 17 mission. The first material called "duck tape" was long strips of plain non-adhesive cotton duck cloth used in making shoes stronger, for decoration on clothing, and for wrapping steel cables or electrical conductors to protect them from corrosion or wear. [4]
Also metal joints place an additional loads onto duct segments. Metal joints prefer axial movements, and provide significant lateral loads onto duct segments. fabric joints cost $100 to $200 per square foot of joint (2010). Metal joints can cost twice this amount. fabric expansion duct forces are assumed to be 0 #/inch.
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