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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.
Air sock in an indoor swimming pool. An air sock is a textile or fabric duct used for draught-free air distribution and delivery of conditioned air as an alternative to traditional spiral or rectangular steel ducts with grilles and diffusers.
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).
Duct segments are typically separated with metal or fabric expansion joints. These joints are designed and detailed for the duct suction pressure, temperatures, and movements between duct segments. Fabric joints are often chosen to separate the duct segments because they usually cost 40% less than metal joints.
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]
1. Components made of multiple smaller blades, sometimes adjustable, placed in ducts or duct entries to control the volume of air flow. When used inside of ducts, their function is similar to that of a damper, but they can be manufactured to fit larger openings than a single-piece damper. 2.