... -25°C to + 250°C5,Operating presure -2000pa (max)6,Air velocity -25m/s (max)7,Standard length-1.5m , 3.0m , 4mm ... the max is 4m8,Compression ratio- 1: 39,Fire resistance ... /medium pressure central HVAC system and ventilation ,cooling,exhaust and air conditioning heating system. Diamater Thicknessmm(Inch) mm2”500.083750.084 ...