The Kidde Firex i4618AC is a 120V AC hardwired ionization smoke alarm from the Firex pro/contractor sub-brand, designed for use in interconnected systems. It supports up to 24 interconnected devices (18 initiating) including smoke, CO, and heat alarms. Alarm memory with a red LED identifies the initiating unit in the system. The Hush feature silences nuisance alarms. This Firex model is recognized on NFPA installation lists and has been replaced by the Kidde 20SAR.
What is the Firex brand?
Firex is a Kidde sub-brand targeting the professional contractor and builder channel. Firex alarms are recognized on NFPA installation lists and are commonly specified by building professionals for residential new construction and renovation projects.
How many alarms can be interconnected with the i4618AC?
The i4618AC supports hardwired interconnect with up to 24 compatible Kidde devices, with up to 18 initiating devices. All alarms in the system sound when one detects smoke, CO, or other hazards.
What does alarm memory do on the i4618AC?
The alarm memory causes the red LED to flash on the unit that first triggered an alarm, helping identify the initiating alarm in an interconnected system for troubleshooting and follow-up.
Is the i4618AC still sold?
The i4618AC has been discontinued. Kidde recommends the 20SAR DETECT-line model as a current replacement for Firex hardwired installations.
Does the i4618AC include a battery backup?
Yes. The i4618AC includes a 9V battery backup for continued operation during power outages. Replace the battery annually or when the low battery warning chirp sounds.
# Kidde Firex Hardwired Ionization Smoke Alarm **Model:** `i4618AC` **Brand:** Kidde **Category:** Smoke Alarm Hardwired > The Kidde Firex i4618AC is a 120V AC hardwired ionization smoke alarm from the Firex pro/contractor sub-brand, designed for use in interconnected systems. It supports up to 24 interconnected devices (18 initiating) including smoke, CO, and heat alarms. Alarm memory with a red LED identifies the initiating unit in the system. The Hush feature silences nuisance alarms. This Firex model is recognized on NFPA installation lists and has been replaced by the Kidde 20SAR. ## Specifications | Attribute | Value | |---|---| | Product Type | Smoke Alarm | | Alarm Type | smoke | | Sensor Smoke | ionization | | Power Source | hardwired-ac | | Voltage | 120 | | Battery Backup | Yes | | Battery Type | 9V | | Battery Replaceable | Yes | | Voice Alerts | No | | Smart Wifi | No | | App Connected | No | | Ring Ecosystem | No | | Interconnect | Yes | | Interconnect Type | hardwired | | Wire Free Rf | No | | Max Interconnect Devices | 24 | | Max Initiating Devices | 18 | | Self Testing | No | | Hush Feature | Yes | | Smart Hush | No | | Strobe | No | | Egress Light | No | | Alarm Db | 85 | | Ul Smoke | UL 217 | | Warranty Years | 10 | ## What's Included - alarm unit - 9V battery - wiring harness - mounting hardware - quick install guide Source: https://www.jaspecs.com/kidde/smoke-alarm-hardwired/i4618ac-kidde-firex-hardwired-smoke-alarm/