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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Magnetic Insulated Roof Vent Sun Cover for MaxxAir Fan, Fantastic Fan 16.5" x 16.5" (COOL GRAY)

Product ID: 303892259

Details

Brand
VanEssential
Closure Type
Magnetic
Color
Cool Gray
Item Weight
8.8 ounces
Material
Aluminum

🧲Magnetic closure for effortless install

☀️UV-resistant ripstop polyester for long-lasting durability

🛡️Reflects 95% radiant heat with double foil insulation

$111.30

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧲 Cool your ride, effortlessly—because your van deserves the best cover.

COMPACT PORTABLE - Includes a sleek storage sack for easy packing and on-the-go convenience.
UV RESISTANT DURABILITY - Ripstop polyester fabric stands up to harsh sun exposure without fading or tearing.
EFFORTLESS MAGNETIC SEAL - Snap on/off in seconds—no tools, no hassle.
SUPERIOR HEAT REFLECTION - 5mm double-foiled insulation blocks up to 95% of radiant heat, keeping your van cooler.
PERFECT FIT FOR MAXX AIR FANTASTIC FANS - Tailored 16.5" x 16.5" size ensures a snug, secure fit every time.

The VanEssential Magnetic Insulated Roof Vent Sun Cover is a precision-fit accessory designed for MaxxAir and Fantastic Fans measuring 16.5" x 16.5". Featuring a magnetic closure for quick installation, it uses 5mm double-foiled aluminum XPE insulation to reflect up to 95% of radiant heat, while durable UV-resistant ripstop polyester ensures long-lasting protection. Lightweight and portable with an included storage sack, this cover is a must-have for millennial vanlifers seeking comfort and style.

Specifications

ASIN	B08W1P3D1V
Best Sellers Rank	#18,797 in Automotive ( See Top 100 in Automotive ) #46 in RV Ventilation
Brand	VanEssential
Brand Name	VanEssential
Closure Type	Magnetic
Color	Cool Gray
Customer Reviews	4.7 out of 5 stars 1,076 Reviews
Item Weight	8.8 ounces
Manufacturer	VanEssential
Manufacturer Part Number	VE3012
Material	Aluminum
Material Type	Aluminum
Model Number	964222c0-8f4a-4b2d-8847-96da6cf4d693
Number of Items	1
Number of Packs	1
UPC	850026467000
Unit Count	1 Count

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$111.30

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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