Smoke detector coverage

Which smoke detector is the best? What is the maximum area coverage by a smoke detector? What do smoke detectors actually detect? Do smoke detectors actually save lives?

Where there is a requirement for more than one device in an area, these radii must overlap to ensure that there are no blind spots. Table Smoke Detector Spacing Based on Air Movement.

A corridor which is 100-feet long and 10-feet wide, for instance, would require smoke detectors under their listed spacing (30-feet spacing on center and 15-feet to the corridor ends). If a detector was placed in a room with a flat ceiling it would take longer to activate than one placed at the highest point of the ceiling where gas and smoke would collect. A smoke detector is a special device that is designed to emit a high, piercing signal or voice alarm when smoke or flames is detected.

It is important to get the right kind for your home. There are actually specific places in the home that certain smoke detectors perform better. We will tell you want those places are. Smoke , Heat, and Duct Detectors Application Bulletin shown in the figure below.

Detector coverage is typically represented as a square because most structures have flat sidewalls. Actual detector coverage is a circle whose radius is 0.

Question: Is it the intent of the Committee that only devices which comply with the definition of a smoke detector in 3. Height from ground is an important issue for a correct protection. We have up to date information on the newest fire alarm trends such as fire service access elevators, mass notification, voice intelligibility, occupant evacuation elevators and. Photoelectric smoke detectors send out a beam of light to check for smoke on a vertical or horizontal beam that is quite narrow (depends on mount). Radioactive (carbon sensitive) smoke alarms need the smoke to gather at the detector to trigger the alarm. Placement not coverage is the issue.

You can include your smoke detector on this plan as well as coverage for major components of a minimum of nine other systems and appliances. These have proven to be life-saving devices. Smoke detectors are designed to warn individuals that something is on fire. If your oven is particularly smoky, it can set the smoke detector off every time you cook. The best placement for smoke detectors is on the ceiling, but if you have to mount them on the wall, make sure it’s within 6-inches from the ceiling.

Also, avoid placing smoke alarms within feet of kitchen gadgets to avoid false alarms. Using both ionization and photoelectric smoke sensors, you will have coverage over all types of fires that can start in a home. It features an intelligent sensing technology that reduces the amount of non emergency alarms for things like smoky cooking, etc. The maximum distance between two smoke alarms should be feet. If a hallway is greater than feet, a smoke alarm must be installed at each end.

In these applications, a designer can place smoke detectors to detect fires in a specified area or equipment location and not use these detectors for general alarm and evacuation. Selective coverage intends to address only a specific hazard and does not intend to provide early warning.

What the section is saying is you need manual pulls AND an automatic fire detection system (heats or smokes) BUT smokes have to be used in waiting areas (not heats) that open into corridors.