Most Popular 4-1/4 Inch for 2021 Ram ProMaster 2500

Great instructions. Very nice product. Installed nicely and looks beautiful. You will need to buy the butyl tape to properly install and of course the self leveling roof sealant.

This vent fan helps a lot with keeping my 7x14 cargo trailer cool. Did a lot of modifications with my trailer especially insulating the ceiling and now with this fan makes it better and cooler. The lid is always open to let the heat out because i have the MaxxAir II cover so rain cant get in. Fan runs better with more or bigger airflow from the side vents when all doors are closed so i added the Redline II popup vent and it works great. Fan does not slow down. Im glad i got this and will be purchasing again when i get another trailer. Thanks ETrailer

works great, i have several and they keep the generators from overheating

Very happy with the fan. I replaced an OEM fan on my older Itasca because of the noise and also the seal had deteriorated over the years. This has several advantages; removable screen, extremely quiet fan, 4 speed motor. I was unable to find a replacement seal for the MaxxFan. Unsure whether a universal seal will work so that could be an issue. Once installed it would be good to know that parts that may fail over time are actually replaceable like the fan blades, the fan motor, the switch and the seal. Can't really tell if any of this is possible.