Truma Combi vent mouse guard

A grid to keep mice from getting into the ducts on your Truma Combi RV heater. Snaps into the duct to block the opening. Printed with PC (Polycarbonate) so it can handle the high air temperature.
Update: there is some data that shows that some mice might be able to get thru an opening larger than 6mm. The grid now has a smaller 6mm spacing.
There are now 3 options: the original "snap in" version, a new version that screws on, and a stick on one that attaches with double sided tape. The screw on and stick on versions will fit on the Truma ducts that have the louvers, like the under bed vent in the G models. Since they are easier to print they cost less.
Note: Some Truma heaters run hotter than specs, they get hot enough to soften the snap in tabs enough that they don't fit. I am going to discontinue the "snap in" version because of this... if you are concerned about this I recommend ordering the screw on version.