TL;DR: A fire alarm inspection starts at the control panel and a call to the monitoring center. Then each device and connected system is tested one at a time, the system is restored, and you get a written report listing any deficiencies. In the Denver metro area, plan for horns, door releases and tests of your alarm’s signal path, especially in older buildings that still send signals over copper phone lines.
During a fire alarm inspection, a technician checks the control panel and tells the monitoring center the system is on test. Then they set off every detector, pull station, horn and strobe one at a time. The visit ends with battery and communicator checks, a full system restore and a written report listing anything that failed.
This guide walks through what happens during a fire alarm inspection in the order it usually goes on a Denver-area commercial building. The work follows NFPA 72, the National Fire Alarm and Signaling Code, plus any amendments your city has adopted. Most cities on the Front Range adopt the International Fire Code with local amendments, so small details can change from Denver to Aurora or Arvada.
What happens before the technician tests anything?
The visit starts at the fire alarm control panel. Nothing gets tested until everyone who could react to an alarm has been told.
- Panel check. The technician reads the panel and writes down any trouble, supervisory or alarm conditions that were already there. Colorado’s Division of Fire Prevention and Control inspection checklist tells inspectors to note any trouble lights at the panel and ask the facility about them.
- Monitoring center call. The tech calls the central station and puts your account on test. That way, alarms during the visit are logged and not passed on to emergency services.
- Occupant notice. Staff and tenants are told that testing has started. A state health department guide to fire alarm testing explains that NFPA 72 calls for notifying all affected parties before any scheduled test.
- Records review. The tech pulls past reports and drawings, often from the documents box mounted near the panel. That tells them how many devices to find and where they are.
How are detectors, pull stations, horns and strobes tested?
Each device is tested by itself, room by room. The technician confirms that the panel got the right signal from the right device.
Smoke detectors get a dose of listed test smoke. Heat detectors are tested with a heat tool or a method that fits their type. Pull stations are pulled and then reset with a key. Horns and strobes are checked for sound and flash in every area they cover. On many addressable panels, the tech can run a walk test. In walk test mode, one person sets off devices while the panel logs each one. Duct detectors on rooftop units are tested too, which in Colorado means working on the roof in whatever weather the season brings.
| Type of check | What the technician does | What you will notice |
|---|---|---|
| Visual inspection | Looks at each device for damage, paint, dust covers, blocked access or missing devices | A tech with a ladder and a clipboard or tablet |
| Functional test | Sets off the device with test smoke, heat, a key or a pull and confirms the signal at the panel | Short bursts of horns and strobes, unless the system is in silent walk test |
| Sensitivity test | Checks that smoke detectors respond within their listed range, on a schedule set by NFPA 72 and not at every visit | Usually nothing. Some panels report readings on their own |
| Interface test | Confirms the alarm triggers connected functions such as door releases and fan shutdown | Doors swing shut and air handlers stop for a short time |
Expect some noise. Most crews sound horns in short bursts and warn tenants first. If a tenant can’t be interrupted, like a medical or dental office, ask to have their suite tested first or at an agreed time.
What happens during a fire alarm inspection at the panel and communicator?
The technician tests the parts that keep the system powered and reporting: backup batteries, power supplies and the communicator that sends signals to the monitoring center.
- Batteries are checked for date, condition and charge, then load tested to show they can run the system during a power outage.
- The panel’s trouble reporting is tested, for example by opening a circuit to make sure the panel reports it.
- Alarm, supervisory and trouble signals go to the central station. The operator confirms that each one came in with the right account and zone.
This step matters a lot in older Denver commercial buildings. Many of them still send alarm signals over copper phone lines. The FCC’s tech transitions page says providers will retire aging copper networks wherever fiber, wireless or satellite service can replace them. If a carrier shuts off a line your panel depends on, the panel can lose its connection to the monitoring center. Cellular and IP communicators replace those copper lines. A Potter panel with a radio communicator is a common setup for this reason.
How does the alarm test cover sprinklers, doors and fans?
A fire alarm inspection also proves that the alarm responds to, and controls, other building systems. The Colorado checklist tells inspectors to confirm the connection between the sprinkler and fire alarm systems.
- Waterflow switches: water is flowed at the inspector’s test valve, and the panel should show an alarm.
- Valve tamper switches: turning a control valve partway should send a supervisory signal.
- Dry and pre-action systems: these are common in Colorado because winter freezes pipes in unheated loading docks, attics and parking garages. Their air pressure switches report low air as a supervisory signal. In a pre-action system, water enters the pipes only after a fire is confirmed, so the detection side has to work.
- Door holders: magnetic holders should let go, and the doors should close and latch.
- Fans and elevators: where these are connected, the alarm should shut down air handlers and send elevators to the correct floor.
Scheduling the alarm test alongside your NFPA 25 sprinkler inspection can save a trip, because one water flow tests both systems.
What happens after the inspection is finished?
The technician resets every device and returns the panel to normal. Then they call the monitoring center to take the system off test and confirm that signals are coming through again.
Next, you get a written report. The Colorado checklist tells inspectors to make sure every device is listed by itself on fire alarm reports. It also says those reports should be done at least semiannually and annually. Anything that failed is listed as a deficiency. Some are small, like a dust cover left on a detector. Others can stop the system from working, like a dead communicator or failed batteries. If your report has open items, our guide on what to do after a failed fire inspection in Denver walks through the next steps. For a full list of what gets checked, see the annual fire alarm inspection checklist for Colorado properties.
Signs you should call before your next inspection
- The panel shows a trouble or supervisory light that won’t clear.
- Your monitoring provider reports missed check-in signals.
- Your phone carrier sent a notice about changes to copper lines.
- A tenant finish moved walls, added rooms or changed how a space is used.
- You have had false alarms with no clear cause.
- Backup batteries have no date label or look swollen.
Why Pre Action Fire is a fit for fire alarm inspections
- Pre Action Fire, Inc. has served businesses across the Denver metro area since 2009.
- All of our technicians are NICET certified.
- Our inspection work follows NFPA 72 and Colorado State Fire Marshal requirements.
- We provide 24/7 fire alarm monitoring through a UL listed central station, including supervisory and trouble signals.
- We regularly service Potter fire alarm panels with documents boxes and radio communicators.
- Emergency service is available 24/7, and quotes are free.
To schedule a fire alarm inspection anywhere in the Denver metro area, including Broomfield, call (303) 682-0113 or request a free quote at preactionfire.com.
Frequently Asked Questions
How long does a fire alarm inspection take?
It depends on how many devices you have, how easy it is to reach roofs and locked suites, and how many connected systems need testing. A small building with one panel can often be done in one visit. A large multi-tenant building may take more than one.
Will emergency services respond if an alarm sounds during testing?
Not if the monitoring center has your account on test. Alarm signals are logged while the account is on test and are not passed on. That is why the technician calls the center before testing starts and again before leaving.
Do tenants need to be there for the inspection?
Someone needs to give the technician access to every suite, closet and roof area with devices. Arrange keys or an escort ahead of time so no suites get skipped and you don’t need a return trip.
Can my building stay open while the fire alarm is tested?
Usually, yes. Expect short bursts of horns and strobes, doors closing on their own and air handlers stopping for a moment. Let occupants know ahead of time so nobody evacuates by mistake.
Recommended Reads
- What Happens If Your Denver Business Fails a Fire Inspection and How to Fix It Fast
- What UL Listed Fire Alarm Monitoring Means for Your Denver Business
- What Does Commercial Fire Alarm Monitoring Cost in the Denver Metro Area?