My bus doors have 1" gaps above, below, and on the outside, and a 6" gap between the doors.
The side gaps have thin rubber gaskets on the outside that mate up pretty well.
The gap between the doors have thick rubber bumpers, to avoid crushing people.
It's the top and bottom gaps that are killing me. They are mostly spanned with broom-like brushes, and also have fist sized open gaps (above and below the rubber bumpers).
Are there common ways to address this problem? Should I be making rubber sweeps for the doors to replace/extend the brushers?
building a sedan style door to fit in the doorway will be the most successful at sealing wind noise.
The bi-fold transit door was for getting passengers on and off without whacking them with the door.
Eagle owners were very good at welding the two bi-fold doors together, maintaining the appearance and visibility, and adding a hinge mechanism.
Alternatively, look closely at an MCI bi-fold door on the commuter coaches near you, to see if there are ideas that will work to seal yours.
happy coaching!
buswarrior
While many would not like the looks of what I did, on my AMGeneral transit, I added 1x3 ash frame to the inside of the door frame and had custom RV doors to fit. While not obvious, when you do that, you realize that the sides of the bus are not straight. On mine-there are three angles. Once painted, it isn't that noticeable. My doors have been on for 22 years without problem (other then replacing weather stripping). Good Luck, TomC