What is the Diameter of the Flange on the Ventline Vanair Trailer Roof Vent VP-543SP?
Updated 03/29/2026 | Published 03/21/2026
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Question:
What is the diameter of the flange?
asked by: James
Expert Reply:
Hey James. The Ventline Vanair Trailer Roof Vent item # VP-543SP flange has a 8-5/8" diameter. It fits a 6-1/4" diameter cutout and extends 2-3/8" when closed and 3-1/4" when open above the roof.
What kind of trailer or motorhome are you looking to install this roof vent on?
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The Ventline Vanair item # VP-543SP is a low profile fan that is powered off of 12v. It's going to drop right down into your cutout for a clean install with a tight seal. This is a really nice vent that has a quiet operation and only draws 1-1/2 amps during operation.
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Doug L.
3/27/2026
I have this in the sleeper area of my Peterbult Semi it was a replacement for the original one that I use regularly and the first one lasted over 20 years so yes I have been very happy with the unit
Product Page this Question was Asked From
Ventline Vanair Trailer Roof Vent w/ 12V Fan - 6-1/4" Diameter - Smoke
- RV Vents and Fans
- Vent
- Roof Vent
- Manual Lift
- 12V Fan
- Plastic
- Tinted
- Ventline
more information >
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Paul
3/26/2026
Hi James. I purchased the vents a few months back but they are still not connected. I’m waiting for an electrician to come out. Otherwise I’m very happy with them and bench tasted them before installation. I was pleased with the amount of air they moved.!