Up until now never needed to know any of this stuff. Dumb question time (cause I don't know). When you buy round thru the dash vent, or for that matter the round under dash vent pods,..Does the round vent come apart/unscrew so that it can clamp/ sandwich around the hole. ?
Hose adapter screws off the bezel. Install bezel into dash. Screw adapter on the backside. Install hose. May have to zip tie the hose to the adapter. Some put one screw in the hose.