Here you can purchase EasiFlex 100 - 100mm (4" 5inch) Round and Rectangle Flexible Ducting in a varity of lengths:
Fits 100mm i.d. Connections by using treaded hose connector (1244) or to 100mm o.d. Connections using connector (1264). Alternatively use an adjustable hose clip (1254).
|100mm Flexible Round and Rectangle Ducting|