US Sunlight Spectrum 21 in. Tubular Skylight with 12 ft. Flex Tube and Ceiling Lens-2121ST-12 - The Home Depot

US Sunlight

Model # 2121ST-12

Internet # 204200928

Spectrum 21 in. Tubular Skylight with 12 ft. Flex Tube and Ceiling Lens

US Sunlight Spectrum 21 in. Tubular Skylight with 12 ft. Flex Tube and Ceiling Lens

This item has been discontinued.
The Home Depot no longer carries this specific product.

$429.00 / each


Model # 2121ST-12

Internet # 204200928

The U.S. Sunlight spectrum series of skylight tubes offer an industry first for light tunnels - a ventilation option. With simple snap-on, snap-off installation, convert your spectrum skylight tube in to a passive ventilator. This simple addition makes the spectrum series an even better choice for restrooms, kitchens, garages, laundry rooms and any place where day lighting and ventilation are desired. Simply install utilizing the ventilation tabs on the roof dome and install or remove the ceiling ventilation hardware to convert to passive ventilation or revert back to energy efficiency.

  • Captures light with the larger 21 in. roof dome, 21 in. flexible tube diameter and 21 in. ceiling lens
  • Impact-resistant roof lens - hail resistant and capable of carrying a live load of over 260 lbs.
  • 12 ft. of flexible tube included for simplified installation process
  • Requires 22.5 in. between roofing rafters and ceiling joists for proper installation
  • Ventilation conversion kit included
  • No reframing or major structural alterations are necessary to install the spectrum skylight tube - do-it-yourself installation can be done typically in an afternoon


Assembled Depth (in.)  35.5 in  Assembled Height (in.)  148.5 in 
Assembled Width (in.)  35.5 in  Daylight area (sq. ft.)  269 
Product Depth (in.)  35.5  Product Height (in.)  148.5 
Product Width (in.)  35.5  Rough Opening Height  138 in 
Rough Opening Width  21 in 
Color Family  Black  Flashing Included  Yes 
Hardware Included  Yes  Low-E (Y,N)  No 
Material  Acrylic  Maximum roof pitch (degrees)  30.26 
Minimum roof pitch (degrees)  18.43  Product Weight (lb.)  27.4 lb 
Returnable  90-Day  Severe weather ready  Yes 
Skylight Mounting Type  Self Flashed  Tunnel type  Flex 
UV protection (%) 
Warranty / Certifications
Energy Star Qualified  Not Qualified 



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