BRK Models FG250 are single station smoke alarms specifically designed for residential and institutional applications including sleeping rooms of hospitals, hotels, motels, dormitories, and other multifamily dwellings as defined in standard NFPA101.
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| Features |
| Dual Ionization Sensor |
| Silence Feature |
| Tampering Resistant Locking Pin |
| Missing Battery Tab |
| Hinged Cover for Easy Battery Replacement |
| 9V Battery Included |
| 10-Year Limited Warranty |
BRK 4120 Series to 9120 Series Cross Reference Chart
| Old Model No. | New Model No. | Description |
| 4120 | 9120 | AC BRK Smoke |
| 4120-12ST | 9120-12ST | AC BRK Smoke in 12-pack Stadium Tray |
| 4120 | 9120 | AC BRK Smoke |
| 4120AB | 9120AB | AC/DC BRK Smoke w/Alkaline Battery |
| 4120B | 9120B | AC/DC BRK Smoke (includes silence) |
| 4120B-48B | 9120B-48B | AC/DC BRK Smoke 48 bulk pack |
| 4120B-48P | 9120B-48P | AC/DC BRK Smoke 48 pack |
| 4120B-GFD | 9120B-GFD | AC/DC BRK Smoke Gravity Feed Display |
| 4120LB | 9120LB | AC/DC BRK Smoke w/Lithium Battery |
| 4120SAB | Obsolete | Not needed-Silence is a standard feature |
| 4120SB | Obsolete | Not needed-Silence is a standard feature |
| 4120SB-12ST | 9120B-12ST | AC/DC BRK Smoke 12 pack Stadium Tray |
| 4120SB2 | Obsolete | AC/DC BRK Smoke 2 pack-Retail |
| 4120SB-48B | Obsolete | Not needed-Silence is a standard feature |
| 41206CP | 91206CP | AC BRK Smoke Contractor bulk 6-pack |
| 4120SB6CP | 9120B6CP | AC/DC BRK Smoke Contractor bulk 6-pack |
| 4120SB-GFD | Obsolete | Not needed-Silence is a standard feature |
| 4919A | 9120A | AC BRK Smoke Canada |
| 8120BL | Obsolete | Not needed. Latching is a standard feature. |
| SA4120B-48B | SA9120B-48B | AC/DC First Alert Smoke 48 bulk pack |
| SA4120CN | Obsolete | AC First Alert Smoke-clamshell |
| SA4121B-48B | Obsolete | Not needed-Silence is a standard feature |
| SA4121CN | SA9121CN | AC/DC First Alert Smoke-clamshell 3-pack |
| SC6120B | SC9120B | AC/DC BRK Smoke/CO combo |
| None | SC9120B-GFD | AC/DC BRK Smoke/CO Gravity Feed Display |
| None | SC9120BA | AC/DC BRK Smoke/CO combo-Canada |
| SC6120B-12ST | SC9120B-12ST | AC/DC BRK Smoke/CO combo-12-pack stadium tray |
| SA4121CN3 | Obsolete | Replaced by SA9121CN |