Aiphone GF-3B 3-Module Flush Mount Back Box
The Aiphone GF-3B is a mounting accessory engineered as a structural foundation for modular entrance panel configurations in the Aiphone GT Series intercom systems. This flush-mount back box accommodates up to three modules, allowing you to mix audio and video components at building entry points without retrofitting the wall cavity or rewiring the system.
Key Features
- 3-Module Capacity: Supports simultaneous installation of up to three entrance modules (audio, video, or combination). This flexibility means you can scale from a single audio call station to a full audio-video setup without replacing the back box.
- Flush Mount Design: Recessed mounting into wall cavities keeps the entrance assembly clean and flush with the finished surface — no protruding frames or cables visible from the lobby or entry area. Critical for aesthetics in hospitality, corporate, and multi-family residential applications.
- Organized Wiring Foundation: Provides dedicated routing and connection points for intercom wiring within the entrance assembly. Reduces installation time and eliminates cable bunching that can cause intermittent faults or make future maintenance harder.
- GT Series Integration: Pairs with audio modules (GT-DB, GT-DB-VN) and video modules (GT-VB), allowing you to assemble the exact entrance configuration needed. This modular architecture means you buy only what you need.
- Station Compatibility: Works with the full range of GT Series endpoints — GT-1A audio stations, GT-1C7W and GT-1C7 video tenant stations, GT-1D handset stations, GT-1M3 compact video stations, and GT-MKB-N security guard stations.
- External Signaling Support: Accommodates external relays (GT-RY) and panic switches (GFK-PS-N/C), enabling integration with building automation, door strikes, and emergency alert systems without adding external junction boxes.
Installation Context
The GF-3B (often searched as GF 3B) is purpose-built for installations where a recessed mounting cavity exists or can be cut into the wall. This back box must be installed into the wall before drywall is finished, or retrofit into existing cavities if the wall can be opened. Integrators should confirm wall depth and stud spacing before ordering — the back box is designed for standard 2x4 (or metric equivalent) wall framing.
Once mounted, the entrance modules and wiring terminate into the GF-3B, with cabling run through the wall to a control station (such as a GT-MKB-N or networked video intercom master). This keeps the entry point clean and professional while centralizing cable management behind the scenes.
Complementary Components
Pair the GF-3B with GT Series entrance modules and tenant or guard stations to build a complete audio-video intercom solution. For detailed guidance on planning a modular entrance system, consult the intercom system design guide.
Frequently Asked Questions
Q: Can I install the GF-3B into drywall after the wall is finished?
A: The GF-3B is designed for recessed mounting into wall cavities. Installation into finished drywall requires cutting and patching. For retrofit applications, confirm wall depth and structural integrity before cutting; consult the installation guide for safe procedures.
Q: What modules can I install in the GF-3B?
A: The back box accepts up to three Aiphone GT Series entrance modules, including audio modules (GT-DB, GT-DB-VN) and video modules (GT-VB). You may also integrate external signaling devices like relays (GT-RY) and panic switches (GFK-PS-N/C).
Q: Does the GF-3B come with mounting hardware?
A: The back box includes the structural frame. Confirm specific mounting hardware and fasteners by consulting the installation documentation or contacting your distributor for the complete bill of materials.
Q: Will the GF-3B work with non-GT Series components?
A: The GF-3B is designed exclusively for Aiphone GT Series modular entrance systems. Cross-compatibility with other vendors' components is not supported.
Q: What wall depth is required for the GF-3B?
A: Standard installation assumes 2x4 wall framing or metric equivalent. Confirm actual cavity depth in your design; the back box must fit within the wall thickness without protruding or requiring drywall modification.
Ted PerryPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
The Aiphone GF-3B is a straightforward mounting solution for deployments that demand a clean, integrated entrance look. The 3-module capacity is the key spec here — it gives you genuine flexibility without forcing you to buy oversized or undersized back boxes. In my experience, most multi-unit residential and office buildings settle on a 2-module mix (audio + video), so the third slot becomes a growth path or space for future panic integration without a second installation cycle.
Technical Highlights:
- Flush Mount Cavity Design: Requires pre-planning during construction or wall opening during retrofit. No protruding frame means cleaner aesthetics and fewer vandalism vectors in high-traffic lobbies.
- 3-Module Architecture: The modular design lets you pair audio modules (GT-DB or GT-DB-VN) with video modules (GT-VB) in any combination, avoiding the cost of a larger single-module device or separate installation cycles.
- Integrated Wiring Channel: Organizes cabling within the back box, reducing the risk of loose or pinched wires that plague hastily wired systems. Saves troubleshooting time downstream.
Deployment Considerations:
- Wall Cavity Pre-Planning Required: The GF-3B is not a surface-mount accessory. Your rough-in phase must account for the back box depth. If walls are already framed or finished, retrofit cutting is necessary — flag this with the client upfront to avoid surprises.
- Modular Wiring Complexity: Each entrance module (audio or video) runs separate cabling to the control station or master unit. More modules mean more drops through the wall. Plan your cable runs and conduit routing carefully, especially in retrofit scenarios where existing conduit may be congested.
The GF-3B is the right choice for new construction and major renovations in multi-family, corporate, and hospitality applications where a recessed entrance panel is non-negotiable. Skip it if you need a quick surface-mount retrofit or are installing a single audio-only call station — simpler options exist for those use cases.
