Will Replacement Flange for B&B RV Endura Range Exhaust Vent Fit 2025 Grand Design Momentum 27MAV
Updated 12/01/2025 | Published 11/09/2025
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Question:
I have 2025 Grand Design 27MAV I have vent flap that keeps pulling off due to wind and vibration. Will this item replace the factory item? The OD measures 12.5 x 5.5” Bolt centers are approx. 11.5 x 5.5” I would actually like to upgrade as these flaps do not hold and this will be the second one we have replaced. Something with a hood on the exterior would be preferred.
asked by: Joshua O
Expert Reply:
Hey Joshua! The mounting holes across the top are spaced 3-3/4" so from left to right it is 11-1/4". This is pretty close but, from top to bottom it is 4-13/16" so that doesn't quite line up. You could potentially replace the entire vent with the B&B Endura Range Exhaust Vent # BM57GR. This requires a 10-3/4" long x 4" tall cutout with overall dimensions of 12-9/16" long x 5-7/8" tall.
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Product Page this Question was Asked From
Replacement Flange for B&B RV Endura Range Exhaust Vent - 5/8" - Black
- Accessories and Parts
- RV Range Hoods
- RV Vents and Fans
- Range Hood
- Flanges
- B and B Molders
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Robin H.
12/1/2025
Hey Joshua, how did the swap to the B&B Endura range vent go on your Grand Design? Did it solve the issue with the flap pulling off in the wind? Your results could really help others dealing with the same problem.