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.
Posts Categorized: Fire Safety
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.
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.
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 »
STI Stopper II vs Universal Stopper: Which Pull Station Cover Do You Need?
Protecting your fire alarm pull stations from vandalism, false alarms, and accidental activation is essential for any commercial building. Safety Technology International (STI) makes the two most popular pull station protective covers in the industry: the Stopper II and the Universal Stopper. But which one is right for your facility? In this guide, we’ll break… Read more »
Wheelock Fire Alarm Horns and Strobes: Replacement Buying Guide
Wheelock, now a brand under Eaton, has been a leading manufacturer of fire alarm notification appliances for decades. Their horn/strobe and strobe-only units are found in commercial buildings across the United States — and when it’s time to replace a failing unit or match existing devices in a renovation, getting the right Wheelock part matters…. Read more »
Edwards EST Fire Alarm Parts: Complete Buyer’s Guide
Edwards EST is one of the most trusted names in commercial fire alarm systems. Their Signature series addressable devices are found in hospitals, universities, government buildings, and high-rises across the country. When it’s time to replace a component — whether a smoke detector, module, or power supply — knowing what to look for and where… Read more »
Siemens HFP-11 Smoke Detector: Specs, Discontinuation & Replacement Guide
Everything you need to know about the Siemens HFP-11 smoke detector — specs, compatibility with FireFinder XLS, discontinuation status, and the OP921 replacement. Order at Life Safety Consultants.
