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  2. Heating, ventilation, and air conditioning - Wikipedia

    en.wikipedia.org/wiki/Heating,_ventilation,_and...

    Rooftop HVAC unit with view of fresh-air intake vent Ventilation duct with outlet diffuser vent. These are installed throughout a building to move air in or out of rooms. In the middle is a damper to open and close the vent to allow more or less air to enter the space. The control circuit in a household HVAC installation.

  3. Duct (flow) - Wikipedia

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

    Round duct is made using a continuous spiral forming machine which can make round duct in nearly any diameter when using the right forming die and to any length to suit, but the most common stock sizes range evenly from 4" to 24" (10-60 cm) with 6"-12" (15-30 cm) being most commonly used. Stock pipe is usually sold in 10' (300 cm) joints.

  4. Process duct work - Wikipedia

    en.wikipedia.org/wiki/Process_Duct_Work

    Cement and lime plant duct velocity at normal operations is 3000 to 3200 foot per minute, lead plant velocities are 4000 to 4500 foot per minute, as the dust is heavier. Other industries, such as grain have lower gas velocities. Higher duct gas velocity may require more powerful fans than lower duct velocities.

  5. List of DIN standards - Wikipedia

    en.wikipedia.org/wiki/List_of_DIN_standards

    replacement DIN 3000, DIN 3017-1: Hose clamps with worm gear drive; shape A, DIN 3017-2: Hose clamps – Part 2: Clamps with fastening lugs, DIN 3017-3: Hose clamps – Part 3: Bolt clamps, DIN 3017-4: Hose clamps – Part 4: Technical delivery conditions, DIN 3017-5: Hose clamps – Part 5: Wide strip hose clamps with fastening lugs; Types D ...

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