Security & Comms
PAVA Voice Evacuation Systems in Bangladesh
PAVA (public address and voice alarm) is a speaker system that does two jobs. Day to day it carries announcements, paging and background music. In a fire it takes signals from the fire alarm and plays recorded evacuation messages, zone by zone, so people know where to go. Spoken instructions are clearer than a siren alone.
Quick facts
- Standards
- ISO 7240-16, EN 54-16, EN 54-24, NFPA 72, IEC 60268-16
- Who needs it
- High-rises, multi-floor factories, hospitals, malls, hotels and campuses
- What you get
- Zoned speaker design, recorded messages, fire alarm link and intelligibility check
- Equipment
- Bosch voice alarm controller, amplifiers, EN 54-24 loudspeakers, fire-resistant cable
Scope
What’s included.
Everything below is done by our own engineers and installation team, so one company answers for the result.
- Speaker layout and zoning based on floor plans
- Voice alarm controller and amplifiers with standby capacity
- Ceiling, wall and horn speakers for each area
- Fire-resistant cable and A/B speaker loops
- Fire alarm interface for automatic zoned messages
- Recorded alert and evacuation messages in Bangla and English
- Fireman's microphone for live instructions
- Battery backup and speech intelligibility test
How is PAVA different from an ordinary PA system?
An ordinary PA system is built for announcements. If an amplifier fails or a speaker cable is cut, nobody knows until the next announcement goes silent. A voice alarm system monitors its own amplifiers, speaker lines and power supply continuously and reports a fault at the control panel, the same way a fire alarm reports a broken detector circuit.
It also has priority. When the fire alarm triggers, the voice alarm overrides music and paging, plays the right message in the right zone and keeps running on battery if mains power fails. Equipment certified to EN 54-16 for the controller and EN 54-24 for loudspeakers has been tested for exactly this duty.
What should the evacuation messages say?
Many buildings use phased messages. The floor with the fire and those next to it hear an evacuation message, while other floors hear an alert asking them to stand by. This keeps stairs from filling all at once in tall buildings. Your fire safety plan sets the sequence, and we program the zones to match it.
Messages should be short, calm and in the languages your people understand, usually Bangla and English. Where workers have hearing impairments, visual alarms are added alongside. A fire warden can also take over with the fireman's microphone to direct people away from a blocked stair.
How do you know people can understand the message?
Loud is not the same as clear. Hard floors, concrete ceilings and machine noise in a production hall create echo that blurs speech. Intelligibility is measured with the Speech Transmission Index (STI) under IEC 60268-16, and we check it on site after installation rather than relying on speaker counts alone.
Good intelligibility comes from more speakers at lower volume, the right speaker type for each space and careful zoning. Sewing floors, stairwells, canteens and washrooms each need different treatment. Where a test shows a weak area, we adjust speaker positions or power taps before handover.
How it’s done
How we deliver it, step by step.
- 01
Zone the building
We divide floors, stairs and outdoor areas into speaker zones that follow the fire alarm zones and evacuation plan.
- 02
Acoustic design
Speaker type, spacing and power are chosen for each room's noise level and hard surfaces.
- 03
Install monitored loops
Fire-resistant A/B speaker cables and amplifiers go in so one cable fault does not silence a zone.
- 04
Program and link
Messages, priorities and the fire alarm interface are programmed and tested zone by zone.
- 05
Measure STI
We test speech intelligibility across the building and correct weak spots before handover.
Price guide
What sets the price.
Every site is different, so we price from a survey, not a rate card. These are the factors that move the number, and the written quote shows each one.
- Number of zones and floors to cover
- Speaker count and type for noisy or high-ceiling areas
- Certified EN 54 equipment versus ordinary PA hardware
- Fire-resistant cable lengths and containment
- Battery standby time set by your fire safety plan
- Integration with an existing fire alarm panel
Service areas
PAVA voice evacuation in Chattogram, Dhaka, Gazipur and Narayanganj.
Our engineers survey, install and maintain on site across these cities and the industrial zones around them. For a site elsewhere in Bangladesh, ask and we will tell you plainly whether we can cover it.
- Chattogram
- Dhaka
- Gazipur
- Narayanganj
Frequently asked questions
It depends on the building's occupancy, height and area under BNBC 2020, and on what your fire safety plan and FSCD approval require. Many buyers and insurers also expect voice alarm in large factories and high-rises even where sounders alone might be accepted. We check your drawings and approval conditions first.
The main drivers are the number of zones, the speaker count needed for clear speech, certified versus ordinary PA hardware, fire-resistant cable lengths and battery standby time. A system that only plays music costs far less but will not pass as a voice alarm. We quote after a survey and an acoustic layout.
Usually not as it is. Standard PA amplifiers and cables are not monitored for faults and lack fire-resistant wiring and battery backup. Sometimes speakers can be reused in non-critical areas, but the controller, amplifiers and critical cabling normally need to meet voice alarm standards.
Run a short functional check, such as a message in one zone, weekly or as your fire safety plan sets, and log it. A full annual service should cover every zone, battery capacity, amplifier changeover, fault monitoring and the fire alarm link. Retest whenever the building layout changes.
Most fire alarm panels can trigger a voice alarm through monitored relay outputs, and some connect over a network protocol for more detailed zone information. We confirm what your panel supports during the survey and design the interface so each alarm zone triggers the correct message.
Guides
Read before you buy.
Fire detection
Addressable vs Conventional Fire Alarm Systems: How to Choose
How addressable and conventional fire alarm systems differ, what each costs to run, and which suits a factory, a high-rise or a small office.
2 min read
ReadCompliance
Fire Safety Plan in Bangladesh: What It Includes and How Approval Works
What a fire safety plan in Bangladesh must contain, who needs one, and the step-by-step route from design to Fire Service approval.
3 min read
Read
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