Hinged Maxxair vent covers will not swing open for cleaning

dougrainer wrote:
What IS interesting---- Maxxair come with stainless steel carriage bolts AND Nuts---NOT wingnuts. So, someone replaced the original and this is what happens. Doug

This is true for all 3 of my other MaxxAir covers but the Fanmate 850 came with wing nuts so that it would be easier to open and fold over to clean under it,as did the replacement that they sent me,as pictured below



As you can see there is a piece of springy metal that will engage the hex sides of the wing nut to keep it in place when tightened.