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Dear Sir,Please provide us with your best prices for flexible duct : Specification: 2.10 FLEXIBLE DUCTSA. General: Comply with UL 181, Class 1.B. Flexible Ducts, Uninsulated: Spiralwound steel spring with flameproof vinyl sheathing.C. Flexible Ducts, Insulated: Factoryfabricated, insulated, round duct, with an outer jacketenclosing 112inch (38mm)1. Reinforcement: Steelwire helix encapsulated in inner liner.thick, glassfiber insulation around a continuous inner liner.2. Outer Jacket: Glassreinforced, silver Mylar with a continuous hanging tab, integralfibrousglass tape, and nylon hanging cord.3. Inner Liner: Polyethylene film.D. Pressure Rating: 6inch wg (1500 Pa) positive, 12inch wg (125 Pa) negative.Here& BOQ: 11Flexible ducts11.1150mm diameterM1,490.5111.2200mm diameterM1,686.0011.3250mm diameterM2,038.7911.4300mm diameterM108.1611.5350mm diameterM20.0011.6400mm diameterM53.00Best Regards,