240min PROMATECT®-H cladding to steel ducts ≤ 1500mm Width (without Cover Strips) 2

System in accordance with the requirements of BS 476: Part 24: 1987

  1. PROMATECT®-H board with or without mineral wool, requirements in accordance with table below
  2. PROMATECT®-H collars 150mm wide, thickness in accordance with table below, fitted around the duct on both sides of the wall forming an L shape
  3. Galvanised steel channels minimum 50mm x 50mm x 0.8mm thick coinciding with board joints
  4. Galvanised steel angles 50mm x 50mm x 0.6mm thick
  5. Steel rod hangers, maximum stress allowance in accordance with table below
  6. Galvanised steel channel or angle (see page 3 for size calculation in accordance with weight and dimension of the duct and maximum stress allowance of the hangers)
  7. No. 8 self-tapping screws at nominal 200mm centres
  8. M8 anchor bolts at nominal 500mm centres
  9. Mineral wool tightly packed into aperture between substrate and surface of the mild steel ventilation duct