The Transit cab window air vent inserts install in the window channels of your driver and passenger side doors and are sold in pairs. This is the ABS plastic units made by Terrawagen.
These allow some air flow into your van. You slide them up into the window channel at the top where the glass normally seats, and then you roll your window up to hold them in place.
They are louvered and screened to allow for air flow while keeping the bugs out. If you want an inexpensive option to avoid cutting a hole in your roof for a roof fan, then this is an item to consider. These will not provide the same air flow as an electric roof fan or course. They can also be used in combination with fans, or door screens to maximize fresh air intake.
Fits high roof, medium roof, and low roof full size Transit vans.
If you were looking for the aluminum Transit cab window air vents that have been out for many years - you can find those by clicking here.