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2. Hart & Cooley - Wikipedia

   en.wikipedia.org/wiki/Hart_&_Cooley

   In the second half of the century, Hart & Cooley expanded into many other products lines, including Type-B vent for gas-fired appliances, all-fuel chimney systems and flexible air ducting. Hart & Cooley Inc. celebrated its centennial anniversary in June 2001, and 6 years later moved its headquarters to Grand Rapids, MI, 30 miles northeast of ...

3. 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 ...

4. 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.

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. 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.

7. Diffuser (thermodynamics) - Wikipedia

   en.wikipedia.org/wiki/Diffuser_(thermodynamics)

   A supersonic diffuser is a duct that decreases in area in the direction of flow which causes the fluid temperature, pressure, and density to increase, and velocity to decrease. These changes occur because the fluid is compressible. Shock waves may also play an important role in a supersonic diffuser.