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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).
Equations may be used to determine the weight of warp and weft required for a particular fabric: Weight of warp = (0.65 x qty. of fabric (metres) x no. of warp ends) / count; If there are two colors in the warp, use the following equations: Weight of color A (kg) = (0.65 x qty. of fabric (metres) x no. of warp ends of color A) / count of color A
The fans used to move these gasses are also large, 250 to 4000 horsepower. Therefore, minimizing duct pressure drop by minimizing turbulence at elbows and transitions is of importance. Duct elbow radius is usually 1 1/2 to 2 times the duct size. The side slopes of transitions are typically 10 to 30 degrees.
Textile fibers, threads, yarns and fabrics are measured in a multiplicity of units.. A fiber, a single filament of natural material, such as cotton, linen or wool, or artificial material such as nylon, polyester, metal or mineral fiber, or human-made cellulosic fibre like viscose, Modal, Lyocell or other rayon fiber is measured in terms of linear mass density, the weight of a given length of ...
New York was just a few weeks away from becoming the first American city to adopt congestion pricing, a system designed to alleviate traffic, reduce air pollution and fund public transit. Then, at ...
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