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Technical specifications for pre-insulated foam duct

  • The duct to be made of pre-insulated FOM as Pure PIR panel which resist propagation of fire and non poisonous gases, minimum foam density should be (45kg/m3), foam ducts to be covered with two layers of hard Aluminium with a minimum thickness of 80 micron each, the total thickness of foam panel is 21mm
  • The contractor will provide and install the ducts with all accessories and installation materials
  • Duct sections to be assembled together by means of aluminium flanges equipped with (P.V.C) hidden fastener. The flange corners to be covered with (P.V.C) cover, and sealed silicon rubber. The aluminium flange has to be clean and shut tight without any leakage.
  • Large ducts which one of it’s dimensions is more than 1000 mm should be supported internally by round aluminium profiles. Number of supports and their details to be according to foam panel producer standard.
  • The contractor has to get management approval for installation details. If there is any difference between the duct’s aperture and dimensions on layout ,the modification will be done according to the supervisor’s instructions.
  • Duct supporters to be as following:
  • One every four meters when duct size less than 1000x1200 mm.
  • One every two meters when duct size over than 1000x1200 mm.
  • Air ducts to be manufactured as following:
  • The reducer’s maximum angle should not exceed 30 °.
  • The elbows not be in sharp corners, the central line of elbow should not be less than 1.5 time the width of the duct, otherwise splitters to be installed inside the elbows to direct the air.
  • The contractor is able to change the air duct’s dimension if it’s necessary, keeping the same equivalent section area of it, and this to be approved by the supervision engineer
  • The air duct to be produced, and installed according to (ASHRAE) or (SMACNA) standards.
  • The straight duct will be calculated in square meters, by measurement the outside dimensions of each length of the executed duct.
  • The fittings (elbow, tee, and reducer) will be calculated in square meters by measurement their outside areas.

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