A built-in retainer kit is not the right choice for every sign cabinet. When the application fits, however, it can simplify assembly and reduce the number of separate parts the shop needs to install and track.
Instead of using separate retainers around the entire cabinet perimeter, ESP built-in retainer kits use frame extrusions with the face-retention channel integrated into the profile. Three sides use the built-in retainer frame. The fourth uses a standard frame piece with removable ESP LF Retainers, creating an access point for installing or replacing the two rigid faces.
How Built-In Retainer Kits Work
Excellart’s built-in retainer frame has a face channel integrated directly into the extrusion. The rigid face slides into this channel and is held in place without separate retainers on those three sides.
A typical built-in retainer kit uses: three built-in retainer frame pieces, one standard frame piece, four corner angles, and two removable LF retainers
The standard frame piece forms the fourth side of the cabinet. One removable LF retainer secures the front face on that side, while the second secures the back face.
To install or replace a face, remove the appropriate LF retainer and slide the face through the open side. The cabinet’s fourth frame piece remains in place.
Because the other three sides retain both faces through their integrated channels, a complete double-face cabinet requires only two separate LF retainers. A comparable cabinet with external retainers may require separate retainer pieces around the full perimeter of both faces.
That means fewer parts to install, fewer parts to track, and fewer loose components to transport to the jobsite.
Two Built-In Retainer Cabinet Depths: 6R and 9R
ESP offers built-in retainer kits in two finished cabinet depths. Both are designed for double-face rigid-face sign cabinets and use domestically sourced 6063-T6 aluminum.
The ESP 6R Kit assembles into a 6.5-inch-deep cabinet. It is the lower-profile option when the lighting, mounting, and service requirements do not call for additional interior space.
The ESP 9R Kit assembles into an 8.75-inch-deep cabinet, providing more interior depth for projects that require it.
Both kits use the same basic construction: built-in face channels on three sides and two removable LF retainers on the fourth side.
Why Shops Use Built-In Retainer Kits
Integrating the retainer channels into three sides of the frame reduces the number of separate components that must be installed around the cabinet.
The result is a cleaner face perimeter with fewer external retainer pieces. It can also shorten assembly time by reducing the number of loose parts that must be positioned and secured.
The removable LF retainers make the system practical to service. When one face needs to be installed or replaced, the shop removes the corresponding LF retainer and slides that face through the access side instead of removing retainers from the entire cabinet perimeter.
Built-in retainer kits are a strong fit for standard double-face rigid cabinets, retail signage, repeat cabinet production, and projects where the faces may need to be changed over time.
When Not to Use a Built-In Retainer Kit
The primary limitation is shape: ESP built-in retainer kits cannot be kerf-cut or formed into curves.
The integrated face channels must remain aligned for the rigid faces to slide into place. A curve or radius would interrupt that alignment and prevent the system from working as intended.
Built-in retainer kits are best suited to square and rectangular cabinet shapes where simplified assembly, face access, and a cleaner perimeter are the priorities.
Find the Right Sign Cabinet for Your Project
Use the Excellart Kit Finder to answer a few project questions and find the right kit configuration. For project-specific questions, or just to chat contact the Excellart team at (800) 627-9044 or hello@excellart.com.