Flexible 40x40mm DC fan coupler

This fan coupler designated to attach a 40mm dc fan to a flexible hose. It is designed to exhaust the carcinogen gas from any enclosed 3D printer especially when printing abs parts. The dc fan flow rate is so small so you don't have to worry sucking heated air especially for those who are printing big part with abs.(to prevent warping). This coupler is very flexible so it can rotate 360 and 80 degrees in respective direction.