STI STI-14400NB Low Profile Intercom Housing
Overview
The STI-14400NB is a low-profile polycarbonate protective housing engineered to shield intercoms, keypads, emergency buttons, and fire alarm stations from vandalism, accidental impact, dust, and aggressive indoor or outdoor environments. This is the right choice when you need to protect a vulnerable device without blocking ADA compliance or adding bulk to your wall. The enclosed box design with integrated mounting plate accommodates flush, surface, or weatherproof installation—meaning you can drop it into retrofit jobs where space or code constraints would kill a standard cabinet. Operates on 24VDC, aligning with standard access control and intercom infrastructure, so no separate power supply is required. The UV-stabilized polycarbonate maintains clarity and structural integrity in extended outdoor exposure, and the stainless-steel hinge system handles repeated opening cycles without corrosion or degradation. This housing is built for commercial entries, building lobbies, secured corridors, and any environment where protection and compliance matter equally.
Key Features
- Low-profile ADA compliant design: Meets reach and force standards for accessible entry points—critical if your installation touches public or tenant-occupied space where you face code inspection or accessibility audit exposure.
- 24VDC operation: Draws power from existing access control bus infrastructure. No separate 120VAC supply means fewer conduit runs, simpler load calculations, and one fewer circuit to manage on your panel.
- UV-stabilized polycarbonate construction: Polycarbonate resists UV degradation and maintains optical clarity longer than acrylic or standard plastic, important for door readers or camera windows that must remain legible after years of outdoor sun exposure.
- Stainless-steel hinges: Eliminates corrosion failure modes in salt-spray, humid, or chemically aggressive indoor environments (kitchens, laundries, spray-wash areas). Standard steel hinges rust within months in these settings.
- Integrated weatherproof sealing with gaskets: Supplied gaskets create sealed enclosures that reject dust, rain, and condensation—measurable protection for electronics that would otherwise fail in seasonal humidity swings or direct spray.
- Flexible mounting: flush, surface, and weatherproof configurations: Accepts both rigid ¾-inch conduit connections at top and bottom, adapting to existing building infrastructure without field fabrication or custom brackets.
- Optional relay output (12–24VDC): Enables auxiliary control integration—door strikes, signaling devices, or intercom gating logic—without requiring a separate relay module, reducing panel real estate and wiring complexity.
Integration and Compatibility
The STI-14400NB integrates with STI intercom stations and third-party intercommunication equipment requiring protective housing in mixed indoor or outdoor settings. The 24VDC power spec aligns with most industrial access control systems—standard Honeywell, DSC, Salto, HID, and generic 24VDC intercom loops without custom voltage conversion. The housing accommodates standard-sized intercom faceplates and button modules; confirm faceplate dimensions against the STI-14400NB aperture before ordering to avoid field fit issues. Mounting provisions include both internal sealed and open mounting plates, supporting flush (recessed into wall), surface-mount (on drywall or concrete), and weatherproof configurations using standard conduit terminations. If your installation requires relay-driven auxiliary signaling or gating, confirm relay voltage (12–24VDC) and control logic during procurement so that field wiring aligns with your access control panel output.
Installation Notes
Mount the STI-14400NB using appropriate anchors for your wall type—drywall toggles, concrete wedge anchors, or masonry screws (not included). Rigid ¾-inch conduit connections at top and bottom support weatherproof sealing; if your building code requires all external electrical terminations to be within a sealed enclosure, use conduit entries rather than open-wire feedthroughs. The gaskets are supplied—install them before closing the housing to ensure water and dust rejection. Low-profile design complies with ADA force and reach requirements; verify your specific installation height and force limits against local accessibility codes before commission. If you are integrating optional relay output for door strike or signal device control, verify the relay's 12–24VDC requirements match your access control panel output voltage.
What's in the Box
- 1x STI-14400NB polycarbonate housing assembly with integrated mounting plate
- Gaskets and weatherproof seals (pre-cut for standard window dimensions)
- Mounting hardware (fasteners for internal plate assembly)
Frequently Asked Questions
Q: Does the STI-14400NB require a separate power supply?
A: No. The STI-14400NB operates on 24VDC supplied directly from your access control system's 24VDC bus. No separate 120VAC power supply is needed, which simplifies wiring and reduces panel load.
Q: Is the STI-14400NB waterproof for outdoor installation?
A: The housing is weatherproof when gaskets are properly installed and conduit entries are used for power and signal connections. It is rated for rain and dust exposure; however, it is not rated for full submersion or high-pressure wash-down. For direct spray environments (e.g., truck wash bays), confirm gasket sealing and conduit tightness with your installer.
Q: What's the difference between flush and surface mounting?
A: Flush mounting recesses the housing into the wall (common in new construction), while surface mounting attaches directly to the wall face (typical for retrofits or where wall depth is limited). The STI-14400NB supports both via interchangeable mounting plates.
Q: Can I use the STI-14400NB with third-party intercom brands?
A: Yes, provided the intercom or device faceplate dimensions fit the housing aperture and the device operates on 24VDC. Verify faceplate size against the STI-14400NB opening before ordering to avoid compatibility issues in the field.
Q: What is the optional relay output used for?
A: The optional relay output (12–24VDC) allows the intercom or control logic to trigger auxiliary devices—door strikes, exit signaling lights, or gate relays—without requiring a separate relay module. Confirm your panel output voltage matches the relay requirement during procurement.
Q: Does the polycarbonate housing maintain clarity over time in outdoor sun?
A: Yes. The polycarbonate is UV-stabilized to resist yellowing and hazing from extended outdoor exposure. Standard acrylic or uncoated plastic would cloud or become opaque within 2–3 years in direct sun; this material holds optical clarity significantly longer, which is important for camera or reader windows.
The STI-14400NB hits a real gap in retrofit and new-build access control design: you need to protect an intercom or keypad from casual vandalism and weather, but your code consultant just told you the housing must be ADA-compliant and you're working in a tight wall cavity. The low-profile form factor of the STI-14400NB solves both constraints without field fabrication or custom mounting plates. The 24VDC operation integrates seamlessly into any standard access control bus—no voltage conversion, no new power circuits.
Technical Highlights:
- UV-stabilized polycarbonate: Maintains optical clarity in direct sun for 5+ years without yellowing—material property that matters when your door reader window or camera lens needs to remain legible. Standard acrylic clouds in 2–3 years of outdoor exposure.
- Stainless-steel hinges: No rust in salt-spray, kitchen humidity, or spray-wash environments—a small detail that prevents housing failure at 3–5 years when standard steel corrodes. High-humidity facilities (hospitals, food service, laundries) see steel hinge failure routinely.
- Integrated weatherproof gaskets: Supplied pre-cut gaskets create sealed enclosures that reject dust and condensation—measurable protection for electronics that would otherwise experience seasonal humidity swings or drip damage in covered-but-open areas (loading docks, awning-covered entries).
Deployment Considerations:
- Verify intercom or keypad faceplate dimensions against the housing aperture before ordering—field fit issues waste labor and delay commissioning. Request drawings from both your device manufacturer and STI if there is any doubt.
- Confirm the optional relay output voltage (12–24VDC) matches your access control panel's auxiliary relay output before specifying; voltage mismatch prevents door strike or signaling logic from functioning. This is often overlooked during procurement and discovered during wiring.
This housing is the right choice for commercial lobbies, building entries, and secured corridors where code compliance and environmental protection must coexist—scenarios where a larger cabinet would violate ADA clearance or where conduit feed is the only viable installation method.
