A built-in retainer kit is not the right choice for every sign cabinet. But when the application fits, it simplifies the build and cuts down on loose parts.
Instead of installing separate retainers around the full perimeter after assembly, ESP built-in retainer kits use frame extrusions with the retainer channel built into the profile. Three sides use the built-in retainer frame. The fourth side stays removable and pairs with ESP’s LF retainer, so the face can slide in and out.
How Built-In Retainer Kits Work
Excellart’s built-in retainer frame has an integrated groove built into the profile. The face slides into that groove and is held in place, with no separate retainer needed on those sides.
A typical built-in retainer kit uses the built-in retainer frame on three sides of the cabinet. The fourth side is removable. It does not have the integrated groove; instead, it has a step where an Excellart LF retainer attaches. That removable side is the access point: it is how the face slides in during assembly and how it slides out when it needs to be changed later.
Because the three built-in sides hold the face on their own, the removable side is the only side that takes separate retainers. On a double-face cabinet, that works out to two LF retainers for the entire build, instead of retainers around all four sides.
That means fewer parts to install, fewer parts to track, and fewer parts to leave off the truck.
Two Depths: 6R and 9R
ESP offers built-in retainer kits in two cabinet depths, both double-face rigid and both built from domestically sourced 6063-T6 aluminum.
The ESP-6R Kit assembles into a 6.5-inch deep cabinet.
The ESP-9R Kit assembles into an 8.75-inch deep cabinet for projects that need more depth.
Both use the same construction: built-in retainers on three sides, with a removable LF retainer side on the fourth.
Why Shops Use Built-In Retainer Kits
With the retainer built into three sides of the frame, there is less hardware to handle and less visible retainer around the face. That gives the cabinet a cleaner front.
The removable side is what makes the system practical to service. When the face needs to be installed or swapped, the shop works through that one side instead of pulling retainers off the full perimeter.
That makes built-in retainer kits a strong fit for standard cabinet work where the face may change over time, including retail environments and repeat cabinet runs.
When Not to Use a Built-In Retainer Kit
The main limitation is kerf cutting: built-in retainer kits cannot be curve cut.
If the project calls for a radius, a curved shape, or any kerf-cut construction, this is not the right kit. Built-in retainer kits are made for standard cabinet shapes where assembly speed, service access, and a clean face are the priority.
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.