VELUX VCS 3434 solar-powered venting skylight shown in open position with pre-installed room-darkening shade and wall-mounted remote control.
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34 ½ x 34 ½, VCS 3434, Solar Powered Venting Curb Mount Skylight with Room Darkening Shade

VELUX
SKU:
VCS 3434 2004S
$1,937.00
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VELUX VCS 3434 2004S – Solar Powered “Fresh Air” Skylight  

Bring in daylight and fresh air with the Velux VCS 3434, a solar-powered venting skylight designed to enhance your space with both comfort and energy efficiency. With no wiring required, this curb-mounted skylight is perfect for renovations and new builds alike. The integrated solar panel charges a built-in battery that powers the skylight’s opening and closing—even on cloudy days.

Ideal for kitchens, bathrooms, and vaulted ceilings, the VCS 3434 also includes a rain sensor that closes automatically to protect your home when the weather changes. The remote control makes it easy to circulate fresh air and reduce indoor humidity with the touch of a button.

Key Features & Benefits

  • Solar-Powered Operation – No electrician needed. The solar panel powers the skylight and its built-in battery system.
  • Remote Control Included – Open and close the skylight effortlessly with the wireless remote, ideal for high or hard-to-reach ceilings.
  • Built-in Rain Sensor – Automatically closes the skylight when it detects rain, offering dependable weather protection.
  • Tempered Over Laminated Low-E3 Glass – Energy-efficient and UV-blocking, this advanced glass helps reduce heat transfer and protects interior furnishings.
  • Curb-Mounted Design – Built for use with an onsite-built curb and compatible with standard Velux flashing kits.
  • Size: 34 ½" x 34 ½" (Outside Curb Dimension) – A balanced square skylight that provides both generous daylight and airflow.
VCS 3434 Sizing Dimensions VCS 3434
Inside curb (W"xH") 34 1⁄2 x 34 1⁄2
Outside curb (W"xH") 37 1⁄2 x 37 1⁄2
Maximum skylight clearance (W"xH") 38 5⁄8 x 38 5⁄8

Looking for more control?  Check out these upgrades!

Looking for a different size?  Shop by size below.

VCS Size Code 2222 2234 2246 3030 3046 3434 4646
Inside curb (W"xH") 22½ x 22½ 22½ x 34½ 22½ x 46½ 30½ x 30½ 30½ x 46½ 34½ x 34½ 46½ x 46½
Outside curb (W"xH") 25½ x 25½ 25½ x 37½ 25½ x 49½ 33½ x 33½ 33½ x 49½ 37½ x 37½ 49½ x 49½
Maximum skylight clearance (W"xH") 26⅝ x 26⅝ 26⅝ x 38⅝ 26⅝ x 50⅝ 34⅝ x 34⅝ 34⅝ x 50⅝ 38⅝ x 38⅝ 50⅝ x 50⅝
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Why Choose VELUX Skylights?

VELUX is the world leader in skylight innovation, known for combining daylight and fresh air in ways that enhance comfort, energy efficiency, and home value.

Backed by decades of engineering excellence, VELUX skylights are built to withstand the elements—offering advanced glass technology, automated rain sensors, and solar-powered performance without the need for wiring.

Enjoy peace of mind with industry-leading warranties, curb appeal upgrades, and products that qualify for valuable energy tax credits.

Trusted by homeowners and professionals alike, VELUX helps you bring natural light and ventilation into every corner of your home—with style, simplicity, and lasting durability.

Curb Mount

Roof Pitch

Flashing

A curb-mounted skylight is designed to sit on a raised curb structure built on the roof, making it a flexible option for both new installations and replacements. It’s especially well-suited for flat or low-slope roofs and simplifies installation when replacing older units or working with thicker roofing materials.

Compatible with roof pitches from 0:12 to 20:12 (0° to 60°), curb-mounted models are ideal for retrofits, homes with existing curbs, and roofing types like torch-down, TPO, modified bitumen, or tar & gravel.

Flashing options include ECL low-profile flashing for flat or low-slope roofs with membrane or rolled roofing; ECW step flashing for shingle or shake roofs with a minimum 3:12 pitch; and EMW flashing, custom-fit for standing seam and corrugated metal roofs.