Polyaire Flexible Duct 6m is designed with polyester insulation (R0.6 & R1) to deliver silent, fire-retardant, and durable performance for HVAC ventilation.The layers are bonded with a fire retardant adhesive to ensure long life in all ambient conditions. The insulation is a polyester thermal blanket manufactured to rigid standards.SPECIFICATIONS FOR SILENT MODELSBonded with a fire retardant and slip resistant dry deposit adhesive, this duct construction ensures a long life span in all ambient conditions. This duct is designed for domestic and commercial ventilation and air conditioning systems and is suitable for low, medium and high pressure systems. Highly recommended because of its low resistance, excellent acoustic properties and compliance with all current relevant standards.