Has anyone used this successfully on a Winnebago Boldt?

This can work on all maxxair/fantastic fan roof vents as long as the vent knob does not stick below the roofline. If the knob hangs lower than the flange (due to shallow mount of the vent), it will not work.

Can these be folded back partially to vent and cover most of the fan at the same time?

Yes, the first section of the vent (25%) can be folded down (and hangs) to allow the vent/light to come in as needed.

Will this help keep heat in during winter camping?

Yes, this will help insulate against the cold

Has anyone installed this on a Dometic Fan-Tastic fan?

If you read as in READ the description it clearly states in TITLE too that it does work same way for the Fantastic Fan. Note it states Fantastic Fan which is Dometic Fan TM branded. So yes it fits a Fantastic Fan that's the classic 14.5x14.5 size range. You install THE same way it discusses installing with the Maxxair fans. You'll need to remove the interior flange or finish cover and set cover down on solid flat counter or table surface. Then place the removed frame on top of the cover. Next take the supplied magnets and attach as they show being done. Now you need to secure these placed magnets with tape to keep them in place for good. Now return the frame or flange to the roof using the screws you took out and viola you can now put your magnetic secured cover up on your Roof Fan and have insulation and black out light curtain when needed.

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VanEssential Insulated Magnetic Roof Vent for MaxxAir Fan, Fantastic Ventilator (Anthracite Grey)

Product ID: 442538772

Details

Brand
VanEssential
Closure type
Magnetic
Colour
Charcoal
Item weight
0.53 Pounds
Material
5.0mm double

🧊95% radiant heat reflection

🧲N48 neodymium magnets for strong hold

♻️100% recycled PET fabric

Description

🛻 Sleep Cool, Stay Dark, Live Green — The Van Life Upgrade You Can’t Miss!

ECO CHIC DURABILITY - Crafted from 100% recycled PET plastic bottles, combining sustainability with long-lasting performance.
TOTAL LIGHT BLOCKOUT - Precision fit blackout cover eliminates light leaks, guaranteeing deeper, uninterrupted sleep wherever you roam.
MAGNETIC SNAP ON EASE - Powerful N48 neodymium magnets ensure a secure, fuss-free installation and removal—no tools needed.
TRAVEL READY CONVENIENCE - Includes a matching storage sack for neat packing and quick access on every adventure.
ULTIMATE CLIMATE CONTROL - Reflects up to 95% of radiant heat with premium 5mm double aluminum insulation for year-round comfort.

The VanEssential Insulated Magnetic Roof Vent cover is engineered for MaxxAir and Fantastic 41x41 cm fans, featuring 5mm double aluminum foil polyethylene insulation that blocks 95% of radiant heat. Equipped with powerful N48 neodymium magnets for a secure fit, it’s made from 100% recycled PET plastic fabrics and includes a storage sack. Designed to enhance temperature regulation and blackout capabilities, it’s the perfect eco-friendly upgrade for van dwellers seeking comfort, privacy, and effortless installation.

Specifications

ASIN	B09T1JVCRQ
Best Sellers Rank	29,054 in Automotive ( See Top 100 in Automotive ) 708 in Motorhome Parts & Accessories
Brand	VanEssential
Closure Type	Magnetic
Colour	Charcoal
Country of Origin	China
Customer Reviews	4.5 4.5 out of 5 stars (369)
Included Components	Storage sack and magnets
Item Weight	0.53 Pounds
Manufacturer	VanEssential
Material	5.0mm double foiled aluminum PE insulation, 100% recycled PET plastic bottle fabric
Model Number	VEN
Number of Items	1
Number of Packs	1
Part Number	ROOF VENT
UPC	850037114351
Unit Count	1.0 count

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