Lippert 1621 SHD Replacement and Compatibility With B&W 5th Wheel Hitches

Question:

Thanks for your previous help. I now have a new question. I have a 2020 Grand Design 381M. It has the automatic fans in the garage and kitchen (pictures attached) and the standard crank up and push the button in the bathroom. I want to add the vent covers to all three but are unsure of the correct part number. I believe the MAXXAIR fanmate covers will work on the two automatic vents(pictures) but no one can seem to tell me which one or what I need for the traditional crank up model. If I am correct there are 4 brackets on the automatic ones which should be used for the vent cover. Any help in identifying the correct covers would be greatly appreciated.

asked by: Pete

Expert Reply:

The Trailair Flex Air 5th Wheel Pin Box - Lippert 1621 - 21,000lbs Item # LC369535 is a compatible replacement for your current 1621 SHD pin box. B&W hitches have a rounded 2-piece jaw on this fifth-wheel trailer hitch inhibits rattle and movement by securely wrapping around your trailer's king pin, so you shouldn't have any issues coupling your new pin box.

expert reply by: Kevin C

Cover Brackets
(click to enlarge)

1621 SHD Pin Box
(click to enlarge)

Pete

6/29/2021

Kevin C.

7/8/2021

For your Maxxfan-clear model number 4951KSC and for your other two fans I recommend the MaxxAir FanMate RV and Trailer Roof Vent Cover - 25" x 18-1/8" x 10-1/4" - Smoke # MA00-955003. This cover is perfect for use with high-powered fans and has a wide vent area so that it provides more airflow than standard covers. EZClip pins allow the cover to be opened and closed with ease. This cover attaches to the brackets on the base of the vent with included cotter pins and will allow you to operate your fan in all weather conditions.