Side "U" Channel, "H" Channel, or "L" Angle

Aluminum Side and Sill Channels for Light Gap Reduction

Side "U" Channel, "H" Channel, or "L" Angle feature aluminum side and sill channels to help reduce light gaps between the window frame and the shade fabric in places where room darkening is desired. Not available with all products. Both "U" and "H" channels accept channel liners.

Product Specs

  • "U" Channel dimensions are 1" (25 mm) deep x 2-1/2" (64 mm) wide, and mount to the jamb or face of window opening. Optional caps available for “U” Channel.
  • "H" Channels dimensions are 1" (25 mm) deep x 5" (127 mm) wide and are face mounted.
  • "L" Angles dimensions are 3/4" (19 mm) deep x 1" (25 mm) wide or 1" (25 mm) deep x 2-3/4" (70 mm) wide and mount inside the jamb.
  • Channels available in five colors: clear anodized (standard), black, white, ivory, bronze, or custom powder coat colors.
  • Optional plug buttons, channel liners, and fabric guides available.

ANSI/WCMA A100.1 Compliance

If clutch-operated roller shades are installed in an environment where it's possible that young children will be present, they should comply with ANSI/WCMA A100.1, the Standard for Safety of Window Coverings.

If the shades that you purchase need to comply with this standard, it is your responsibility to inform Draper and opt-in to receive compliant products at time of order.

Spring-Loaded Cord Tension Device

Compliant window shades will include:

  • Pre-installed spring-loaded chain tension device with bead chain threaded through it
  • Approved permanent warning label attached
  • Approved mechanical fasteners for the tension device included

If the tension device is not installed properly, or becomes unattached from the mounting surface, the shade will be rendered partially inoperable. If installed properly, the tension device will prevent the creation of a hazardous loop and will maintain tension on the bead chain. The tension device and label require tools to be removed.


The testing required by the WCMA for products to comply with safety standard A100.1 includes:

  • UV stability testing - AATCC Test Method 16 for UV Stability
  • Impact testing - ASTM D5420
  • Bead chain durability testing
  • Operation cycle testing - 3,000 cycles per the standard

Our spring loaded tension device passed the requirements of these tests.

WCMA compliant hangtag warning label

Supporting Documents

Click the and icons to navigate the folders. Click the document name to download.

Skip Navigation Links.

Part Numbers

  • C090.018 - "U" Channel
  • C090.041 - "H" Channel
  • C104.029 - "L" Angle
  • C151.061.xx - U Channel Caps
  • - Contact Draper for details


Case Studies

Related Motors & Accessories

Got a question?

We've got answers. Contact us about window shades with the form below and let us know how we can help you deliver on your projects.

Your location:


We have automatically detected your location, shown above. If your correct home territory is not shown, please select the correct one so that we may accurately route your question.

What type of installation?

What's your question?

Tell us about yourself.

Your Drape‍r contact information:

Need to contact someone immediately? Your Draper contacts are shown below.

Chuck Photo
Chuck Raible
Regional Sales Manager - Architectural Products, Mid-Atlantic USA
Krystyna Photo
Krystyna Biggs
Window Shade Sales Consultant
Quick Feedback

We would love to get your thoughts so don't hesitate to send us your feedback!

What could we improve? (required)
Please enter the following characters to help us prevent spam: