Channel Letter Types Produce with Ascent Equipment
Ascent unique assembly system allows to produce trimless letters, reverse halo without welding, and Epoxy front letters
UL extrusion/profiles are non-proprietary and can be purchased from Ascent at very competitive prices or in large quantities directly from the manufacturer. Extrusion is painted with Epoxy white that can be used without repainting or as an excellent primer for different colors. Other colors of extrusions are available.
Ascent extrusion system uses a pneumatic gun (supplied with the machine) with tiny stainless-steel nails to make the initial shape of the letter and does not rely on adhesive (the competition's system, which uses glue and a magnet table, makes it almost unmanageable to produce trimless letters).
The Ascent extrusions system is a UL/RU Recognized Component for indoor and outdoor use for letters up to 66" (the competition's own guidance recommends not exceeding 38" for exterior use). Ascent's stainless-steel clip system makes for easy mounting.
The four channel letter constructions
Click on the pictures for larger view
Front-lit trimless letter (ACM)
Front-lit & halo trimless
Reverse halo channel letter
Ascent epoxy channel letters
Channel letter assembly diagrams
How each letter type is built — exploded view of every component
Front-lit trimless (ACM back)
Front-lit + halo trimless
Reverse halo
Aluminum trim-cap
Front-lit trimless (epoxy face)
Side-lit
Gallery letters
(The pictures provided by Ascent's great customers)
These are real channel letters built by Ascent customers, organized by the technique and the machine used.
Trimless letters made with Ascent 5AS
Reverse halo made with Ascent 5AS
Combination of front lit and reverse made with Ascent 5AS
Aluminum trim made with Ascent TMB-3
F-trim made with Ascent 5AS
Plastic side returns made with Ascent 5AS
Flanging letters made with Ascent-Edge or Ascent TMB-3
Neon looks like made with Ascent 5AS or Ascent TMB-3
Stainless steel letters made with Ascent 5AS
Epoxy letters made with Ascent 5AS
Combination letters
Frequently asked
Channel letter types — frequently asked questions
What's the difference between front-lit and reverse halo channel letters?
Front-lit (face-lit) letters have a translucent acrylic face, so light shines forward through the letter itself — the standard, most common channel letter. Reverse halo letters have an opaque face; the light shines backward through the open back of the letter, creating a glow on the wall behind it instead of illuminating the face. Ascent's 4AS and 5AS both produce reverse halo letters without welding.
What is a trimless channel letter, and how is it different from a letter with trim cap?
A trimless letter has no visible plastic or aluminum border around the acrylic face — the face sits flush, mechanically integrated into the extrusion, for a cleaner, more modern look. A trim-cap letter has a visible border strip (plastic or aluminum) framing the face, which is the traditional construction and generally lower-cost. See our full breakdown of Ascent's true trimless construction vs. how other systems use that term.
Do reverse halo letters need a minimum standoff distance from the wall?
Yes, but there's no single fixed number — the right standoff depends on the size of the letter. Most fabricators handle this with a rivet nut (Rivnut) insert in the back of the letter and a threaded rod, which lets you adjust the gap after the letter is mounted rather than committing to an exact distance at fabrication time.
Can I combine front-lit and back-lit letters in the same sign, or even the same letter?
Yes on both counts. You can mix front-lit and reverse halo letters within one sign set, and the 5AS can also produce a single letter with combination-lit construction — illuminating the face and casting a back halo at the same time, sometimes in two different colors.
What is F-trim, and how is it different from trimless or standard trim cap?
F-trim is a distinct middle option: a preformed aluminum profile (cross-section shaped like the letter "F") that creates a narrow, architectural metal border — slimmer than standard trim cap, but still a visible border, unlike true trimless. It's processed exclusively on the 5AS. See the full comparison of F-Trim vs. Ascent TMB-3 aluminum trim vs. true trimless.
Which Ascent machine do I need for each channel letter type?
Trimless and F-trim require the 5AS (the 4AS handles trimless but not F-trim). Traditional trim-cap and reverse halo with welding can be made on the Ascent EDGE-3, EDGE-4, or Ascent TMB-3. Aluminum trim (as an alternative to plastic trim cap) requires the Ascent TMB-3 specifically. Large-format letters over 8" deep need the MAX. Use the free bending machine selection wizard to get a specific recommendation for your letter mix.