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. I added a new version with a smaller 6mm grid spacing. It does take longer to print, so it costs a little bit more. You decide which version is right for you...