Magnetic adapter & cover for laser ventilation to exhaust D 125 mm (freecad included)

I was tired of opening my garage door to let the exhaust of my laser outside, 
so I cut out a hole trough the garage door and let the exhaust trough.

To make it possible to open the door, this connection has to be removable, so I created an magnetic adapated.

To avoid the a heat leaves the well insulated house during winter I made also a cover and filled it with expanded polystyrene (EPS) to insulated the cover.