... 1)ideal for ventilation and air conditioning system 2)Flame retardant vent hose 3)Ducting Semi-Rigid aluminum Flexible Air Ducting for HVAC, ... inside,perfect flexibilityTemperature range:-30°C-+140°C,Max air flow:30m/sMax operation pressure:2500pa.4.Application: ... Used in gigh pressure,low pressure air conditioner and ventilation system,easy installation, graceful apperance, ...