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 |
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