Description
The Simplex 2975-9145 is a commercial fire alarm mounting box designed for compatible Simplex notification appliances. Specifically, it provides a secure mounting solution for approved horn, strobe, speaker, and combination notification devices used in commercial fire alarm systems. This product is intended exclusively for commercial fire alarm installations and is not consumer electrical equipment, communications equipment, surveillance equipment, or recording devices.
Built from durable steel with a red finish, the 2975-9145 supports both flush and surface mounting applications. In addition, it is commonly used in retrofit installations requiring compatible Simplex adapter plates for proper appliance mounting.
Product Functions
The Simplex 2975-9145 supports commercial fire alarm installations by providing:
- Secure mounting for compatible notification appliances
- Flush or surface mounting options
- Support for approved adapter plates
- Durable enclosure for commercial installations
- Reliable mounting for retrofit applications
- Protection for wiring and electrical connections
Electrical & System Information
The 2975-9145 is a passive mounting enclosure and does not require operating voltage. Instead, it provides a secure mounting platform for compatible fire alarm notification appliances installed within commercial life-safety systems.
Furthermore, approved adapter plates allow the enclosure to support a variety of wall-mounted notification appliances depending on the application. Always verify compatibility before installation.
Features
Flush or Surface Mount Installation
The mounting box supports both flush and surface mounting configurations. As a result, it offers installation flexibility for both new construction and retrofit projects.
Heavy-Duty Steel Construction
Constructed from durable steel, the enclosure provides dependable mechanical protection for notification appliance wiring and mounting hardware.
Retrofit Friendly Design
The 2975-9145 is frequently used when upgrading existing fire alarm notification appliances. Consequently, contractors can install newer compatible devices while utilizing approved adapter plates.
Adapter Plate Compatibility
The enclosure works with compatible adapter plates such as the Simplex 4905-9903 and 4905-9931, depending on the notification appliance being installed. Therefore, it supports multiple approved mounting configurations.
Professional Commercial Finish
The red finish provides clear identification as a fire alarm system component while matching commercial notification appliance installations.
Mounting & Design
The Simplex 2975-9145 features a rugged steel enclosure finished in fire alarm red. Furthermore, its rectangular design supports both vertical and horizontal mounting orientations where approved by the installation requirements.
The enclosure accommodates compatible notification appliances using approved adapter plates, making it an excellent choice for retrofit and replacement projects.
Protection & Applications
The 2975-9145 is designed exclusively for commercial fire alarm notification systems.
Typical applications include:
- Horn mounting
- Strobe mounting
- Speaker mounting
- Speaker/Strobe mounting
- Retrofit notification appliance installations
- Commercial fire alarm systems
Always install the mounting box according to local building codes, fire codes, and the manufacturer’s installation instructions.
Compatibility
The Simplex 2975-9145 is designed for use with compatible Simplex notification appliances requiring this mounting enclosure and the specified adapter plate.
Compatible accessories may include:
- Simplex 4905-9903 Adapter Plate
- Simplex 4905-9931 Adapter Plate
- Select TrueAlert notification appliances
Before purchasing or installing this product, verify compatibility with the intended fire alarm device and project requirements.
Technical Specifications
Manufacturer: Simplex
Model: 2975-9145
Product Type: Commercial Fire Alarm Mounting Box
Color: Red
Material: Steel
Mounting Style: Flush or Surface Mount
Orientation: Vertical or Horizontal
Compatible Devices: Select Simplex Notification Appliances
Compatible Adapter Plates: 4905-9903, 4905-9931 (application dependent)
Height: 7-7/8 in (200 mm)
Width: 5-1/8 in (130 mm)
Depth: 2-3/4 in (70 mm)
Application: Indoor Commercial Fire Alarm Systems
Construction: Heavy-Duty Steel
Installation: Commercial Fire Alarm Notification Appliance Mounting
Always verify technical specifications using the manufacturer’s official documentation before installation.
Applications
The Simplex 2975-9145 is commonly used in compatible commercial fire alarm systems serving:
- Office Buildings
- Schools
- Universities
- Hospitals
- Healthcare Facilities
- Hotels
- Government Buildings
- Retail Stores
- Warehouses
- Industrial Facilities
- Commercial Buildings
Before installation, verify compliance with local codes, project specifications, and manufacturer recommendations to ensure proper system operation.




