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 2 options: the original "snap in" version and a new version that screws on. The new screw on version 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.