One of the modifications I made to our Lance trailer was to add insect screens to keep mud daubers out of the furnace exhaust and water heater vents while the trailer is being stored. The little buggers are everywhere out here and while they are not aggressive and don’t sting (at least I’ve never been stung by one) they build their mud nests in small holes and clog things up.
So I bought and installed some screens to prevent this. However, the screens were meant to be mounted with really weak springs. Other Lance owners have complained about brushing up against the screens and knocking them off the trailer. Mine barely made it home from the RV storage lot after I installed it. To rectify this I used some safety wire left over from my airplane builds and fastened the screens on securely. They feel very solid now.
I did have to drill a couple of holes in the water heater access door to attach the screen. The grate that is built into the door comes out too easily.
Both screens feel really solid now and won’t easily be knocked off either by my clumsiness or while driving down the road.