Basic Ventilation Port For 2.5" Vacuum Cleaner Hose

This is a very basic ventilation port made specifically to mount to whatever and accept 2.5" vacuum cleaner hose. I made this for my 3D printer's enclosure box to vent fumes to the outdoors by means of a length of the aforementioned hose. This doesn't have any threading or stop to it, so basically you would insert the end of the rough cut hose, and then you can either glue it in or duct tape it or whatever floats your boat. Six little 4mm mounting holes are provided for a firm connection to what