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2. Microducts - Wikipedia

   en.wikipedia.org/wiki/Microducts

   As indicated in GR-3155, cable is typically placed into the duct in one of three ways: It may be pre-installed by the duct manufacturer during the extrusion process. It may be pulled into the duct using a mechanically assisted or hand-drawn pull line. It may be blown into the duct using a high air volume cable blowing apparatus.

3. Westaflex - Wikipedia

   en.wikipedia.org/wiki/Westaflex

   Westaflex is a large global HVAC brand, owned by German company Westaflex Holding. The company began in 1933 when Lorenz and Ferdinand Westerbarkey, formerly prisoner of war during the Nazi era developed a coil-based tube forming machine, the first stable and any-shape tube of its kind.

4. Duct (flow) - Wikipedia

   en.wikipedia.org/wiki/Duct_(flow)

   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 ...

5. Electrical conduit - Wikipedia

   en.wikipedia.org/wiki/Electrical_conduit

   Liquidtight flexible metal conduit (LFMC) is a metallic flexible conduit covered by a waterproof plastic coating. The interior is similar to FMC. The interior is similar to FMC. Flexible metallic tubing ( FMT ; North America ) is not the same as flexible metallic conduit (FMC) which is described in US National Electrical Code (NEC) Article 348.

6. Plastic pipework - Wikipedia

   en.wikipedia.org/wiki/Plastic_pipework

   Plastic Pipe lengths manufactured in Australia by extruding HDPE material.. Plastic pipe is a tubular section, or hollow cylinder, made of plastic.It is usually, but not necessarily, of circular cross-section, used mainly to convey substances which can flow—liquids and gases (fluids), slurries, powders and masses of small solids.

7. Friction loss - Wikipedia

   en.wikipedia.org/wiki/Friction_loss

   Note that, in approximation, for a given value of flow volume, a step up in duct size (say from 100mm to 120mm) will reduce the friction loss by a factor of 3. Volumetric Flow Q of air at STP where friction loss per unit length Δ p / L (SI kg / m 2 / s 2 ) is, resp., 0.082, 0.245, and 0.816., for selected Nominal Duct Sizes [ 19 ] in smooth ...