Smoke detector area coverage

Where are smoke alarms required? How do smoke detectors detect cigarette smoke? What is the maximum height for a smoke detector? For general area coverage with smoke detectors will be m2.

Chapter of NFPA requires that spacing be based on manufacturer’s recommendations. That gives you a foot circle. In a straight line you can install the next one feet away, you will then get coverage for feet in a straight line.

They are placed at keep points around sleeping quarters, stairwells, and access halls to detect smoke only at those locations. 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). 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). When mounted on a flat ceiling, smoke detection devices have an individual coverage of 7. However these radii must overlap to ensure there are no ‘blind spots’. Therefore individual coverage can be represented by a square measuring 10.

Question: Is it the intent of the Committee that only devices which comply with the definition of a smoke detector in 3. Smoke detector coverage is square metres and temperature smoke detector coverage is square metres. Height from ground is an important issue for a correct protection. However, if the room has solid joist or beam ceilings, you are only required to install one smoke detector.

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. 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. Duct smoke detectors sample great volumes of air from large areas of coverage. They cannot be expected to match the detection ability of area detectors. Dirt contaminated air filters can restrict air flow causing a reduction in the operating effectiveness of the duct smoke detectors. Manufacturer’s recommendations and other factors, such as room geometry, may impose practical reductions of this maximum coverage.

Spot-type smoke detectors are considered to have a maximum cover-age of 9square feet. Among those which directly concern automatic smoke detectors are: NFPA covers minimum performance, location, mount- ing, testing, and maintenance requirements of automatic fire detectors. NFPA 90A and 92A provide information for the use of smoke detectors in ducts of HVAC systems and smoke con- trol systems. The International Mechanical Code section, 606.

Now if your day care is regulated by the state like ours are, they require smoke detectors in sleeping areas. I require them to be tied inot the fire alarm system if one is present. The above are the maximum areas that can be covered by an individual detector. This in a 9square foot coverage area which may be used as a guideline for coverage.

An it is about smoke detection coverage. Smoke detectors shall be installed within the sleeping area of hotel or motel units, rooming units or studio dwelling units in Occupancy Group J-1. Each smoke detector shall have an integral test means to permit the occupant to check that it is operational. A continuous power display indicator light is recommended. Figure 2), area smoke detectors listed for in-duct or partial in-duct mount-ing, a light beam detector consisting of projector and receiver mounted within the duct, and an air sampling type detector.

MX Technology addressable smoke sensor, heat. Smoke Sensors provide accurate photoelectric sensing. Heat Sensors provide electronic heat sensing with. Multi-Sensors combine photoelectric sensing with heat.

Voids in the same fire compartment should be included in the same floor zone. The reasoning is that if the smoke is coming from the return side first it will get sucked up before the detector can and thus the detector is rendered useless. Jim:cool: Jim, that was my original reasoning for identifying this as a possible safety issue.