The Simplex 4905-9839 is a white cosmetic adapter plate for Simplex TrueAlert notification appliances. The adapter plate covers a larger wall or ceiling cutout left from a previous device. As a result, you can install a smaller TrueAlert strobe or horn/strobe without patching drywall.
Cosmetic adapter plates are common on retrofit work. In addition, they reduce labor by eliminating the need to refinish around the new device. Therefore, the 4905-9839 is a small but practical line item on most TrueAlert upgrade projects.
Where the Simplex 4905-9839 Fits Best
Replacing legacy notification appliances often leaves an oversized cutout from the previous unit. First, the installer mounts the TrueAlert appliance to its standard backbox. Then, the 4905-9839 sits over the device to mask the surrounding gap. Specifically, this avoids drywall repair on every device location.
However, the adapter plate is a finish accessory only. It does not change the notification appliance’s listing, candela output, or NAC behavior.
Key Features
- Cosmetic adapter plate for Simplex TrueAlert notification appliances
- White finish for clean integration with standard wall and ceiling surfaces
- Covers oversized cutouts left by previous devices on retrofit work
- Reduces drywall and finish repair labor during upgrades
- Mounts in conjunction with the underlying strobe or horn/strobe
Specifications
- Type: Cosmetic adapter plate (finish accessory)
- Color: White
- Manufacturer: Simplex
- Compatible appliances: Simplex TrueAlert notification appliance line
- Mounting: Standard electrical box compatible
Order from Life Safety Consultants
Adapter plates are easy to overlook on a quote and even easier to forget when planning a retrofit. Furthermore, the correct part number depends on the underlying TrueAlert device and the color desired. Our team can help confirm the right adapter plate for your specific TrueAlert installation before you order.
For more information, contact the Life Safety Consultants team at (888) 557-0558, or email us at: sales@lifesafetycom.com
Additional information
| Weight | 0.1 lbs |
|---|---|
| Dimensions | 8.3 × 5.8 × 0.1 in |
| Condition | New |
| Manufacturers | Simplex |
| Part Type | Strobe |







