steel fixings in accordance with current HVCAspecification DW144 and superseded specification DW142. PLANT ROOM PANEL ABSORPTION SYSTEM - Wilhams Where ductwork is required to be pre-insulated, the specification shouldbe agreed with the designer. (DW144) Ductwork specifications and standards. Design Specification All rectangular ductwork crossjoints shall be the Doby ĭoby Flange System Complies fully with HVCA specification DW144. covered by the construction tables 2 to4 of specification DW144. Slide on Flange specification - Doby Verrolecĭesign Specification All rectangular ductwork cross joints shall be the Doby slide on. All ductwork shall be Spiralite non-metal pre-insulated ducting as. Unique specification by product name: Ductwork. All fittings shouldconform to current HVCA specification DW144.īuilDing & EnginEEring SErvicES ASSociAtion SPECIFICATION FOR SHEET METAL DUCTWORK DW/144Second Edition 2013 DW144 (11112) Dec13 PART 1_La 1. The ductwork installation shall fully meet the requirements of DW144. System pressure I - Federation of Environmental Trade.
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