Heat detectors suit kitchens, mechanical rooms, garages, and attics where smoke detectors won’t survive. Rate-of-rise vs fixed-temperature explained.
Posts Categorized: Fire Alarm Systems
How Often Should Duct Smoke Detectors Be Tested?
Duct smoke detectors should be tested on the NFPA 72 schedule. Watch the sampling tube — wrong length or missing defeats the detector. Sizing guide inside.
The Most Common Fire Alarm Inspection Failures (and How to Beat the Punch List)
Inspection findings cluster in a few predictable places: panel batteries, duct detectors, and missing end-of-line resistors. Here’s how to get ahead of them.
What End-of-Line Resistor Does My Fire Alarm Need?
The correct EOLR value depends on your panel and circuit type. Common values are 47K, 4.7K, 3.9K, and 10K — match what your panel specifies rather than guessing.
How Often Do Fire Alarm Batteries Need to Be Replaced?
Dead or weak standby batteries are the #1 failed-inspection item. NFPA 72 requires capacity testing, most SLA batteries are replaced about every 5 years, and sizing matters.
Why an Obsolete Fire Alarm System Doesn’t Necessarily Need Complete Replacement
When a manufacturer labels a commercial fire alarm system as obsolete, many building owners immediately assume the entire system must be replaced. While there are situations where upgrading to a newer system is the best solution, an obsolete designation does not always mean the system is unsafe, unusable, or beyond repair. Undoubtedly, many commercial buildings… Read more »
The Importance of Quality Batteries in Commercial Fire Alarm Systems
Although we don’t think about them often, batteries play a vital role in keeping businesses of all sizes safe. These small powerhouses that quietly ensure our fire alarms are always ready to sound the alarm when it matters most. So, let’s dive into why quality batteries are a must for your commercial fire alarm system…. Read more »
Simplex Replacement Clocks: How to Replace Your School or Hospital Wall Clock
If your school, hospital, or commercial building has Simplex synchronized wall clocks, you know the frustration when they stop working. These iconic clocks — found in hallways, classrooms, and waiting rooms across America — are tied to a master clock system that keeps every clock in the building synchronized. When a Simplex clock fails, finding… Read more »
Simplex 4100U & 4100ES Fire Alarm Panel: Common Replacement Parts Guide
The Simplex 4100U and 4100ES are among the most widely installed addressable fire alarm control panels in commercial buildings across the United States. From hospitals and universities to office towers and military installations, these Johnson Controls panels protect millions of square feet of occupied space. But even the most reliable panels need maintenance. Circuit boards… Read more »
How to Choose the Right STI Enclosure for Your Fire Alarm Equipment
When fire alarm control panels, power supplies, or notification appliances need to operate in harsh environments, a NEMA-rated enclosure is essential. Safety Technology International (STI) manufactures the EnviroArmour line of enclosures specifically designed to protect life safety equipment from weather, dust, vandalism, and temperature extremes. With dozens of sizes and configurations available, choosing the right… Read more »
