The Fan-Tastic Vent Roof Vent w/ 12V Fan - Clamp On - Manual Lift - 14-1/4" x 14-1/4" # FV801208 is the industry standard size that will work well with your 1995 National RV motorhome whether you have the Dolphin or the Sea Breeze. This will work as a replacement or install in a new location. I've attached a video to assist.
I recommend sealant # 0160297 for this installation. view full answer...