Thanks for the heads up , tho the comment
>I believe those windows were original on the 4104s and many 4106 owners used them as an inexpensive alternative to windows.< ,,, is in error.
I had installed Peninsula Glass windows and got rid of them.
The qualiry was JR High shop level , did not belong on a 4106.
The big function hassle is the PG window is a mere 1/2 slide , so underway NOTHING comes in to add ventilation to the coach.
BUT since the window is in a low pressure area the coach vents OUT a bit thru the unit.
his means all P traps and the toilet bowl wet spot seal must be filled with water .
Or there is a toilet aroma, even tho my setup used 2 inch roof vent pipe.
With the 4104 opening windows there is the ability to open the leading edge and at speed a nice blast of fresh outside air comes in , noisy tho.
The rear of the window can also be opened if desired which is a far better vent than just a flat opening.
Low cost was never the reason to ditch the PG units , and spend years locating enough to build up a set of genuine BUS windows , function underway was key.