A conventional fire alarm divides a building into zones and tells you which zone has a fire. An addressable system gives every detector and call point its own address, so the panel shows exactly which device is in alarm, such as "Smoke detector, 3rd floor, cutting room east". For large or multi-storey buildings, that precision is usually worth the higher cost.
How does a conventional system work?
Detectors are wired in circuits, one circuit per zone. When a detector activates, the panel shows the zone, and someone has to search that zone to find the device. Conventional systems are simple and cheaper to buy, and they suit small buildings with few zones.
How does an addressable system work?
Devices sit on a loop and talk to the panel individually. The panel knows each device's location and status, can tell a fault from a fire, and can be programmed: close fire doors on one floor, recall lifts, start the voice evacuation, signal the fire pump room.
Side-by-side comparison
| Conventional | Addressable | |
|---|---|---|
| Location shown | Zone | Exact device |
| Wiring | Radial circuits, one per zone | Loops, fewer cables on large sites |
| Fault finding | Search the zone | Panel shows the faulty device |
| False alarm handling | Limited | Sensitivity settings, verification, logs |
| Integration | Basic | Doors, lifts, PAVA, BMS and more |
| Upfront cost | Lower | Higher |
| Best for | Small offices, shops, small residential | Factories, high-rises, malls, hospitals |
Which should you choose?
- Small building, few rooms: conventional can be enough.
- Factory floor, warehouse, high-rise or mall: addressable. When a fire starts, the minutes saved finding it matter, and audits value the event log.
- Growing site: addressable loops extend more easily.
What drives fire alarm system price in Bangladesh?
The number of devices (set by area, ceiling height and room layout), the system type, panel capacity, cable routes, integration with other systems, and the approvals required. A survey gives an exact device count; anything else is a guess.
Getting the design right
Detector type matters as much as the system: smoke detectors for most areas, heat detectors in kitchens or dusty spaces, beam detectors in high warehouses. NFPA 72 and BNBC 2020 set the spacing and coverage. Manual call points belong on every escape route, and sounders must be audible everywhere, including noisy production floors.
Keeping it reliable
Test devices on a schedule, clean detectors in dusty environments, and act on fault messages, not only fire alarms. A maintenance contract makes this routine.
Get a fire alarm survey and we'll recommend the right system for your building.