In practice this simply results in drawing a 21 foot circle 0 7 x 30 foot spacing 21 feet around each detector and making sure that every point on the ceiling is covered.
Wall mounted smoke detector coverage.
According to section 5 7 3 2 nfpa 72 2007 edition spot type smoke detectors can be mounted either on the side wall or ceiling.
For smoke detectors the individual coverage can be represented by a square measuring 10 6m x 10 6m giving a coverage of 112m per device which is usually approximated to 100m.
If you have ceilings that are pitched install the alarm within 3 feet of the peak but not within the apex of the peak four inches down from the peak.
Photoelectric smoke alarms are best at detecting smoldering fires while ionization smoke alarms are better at detecting sudden fast burning fires.
Mount smoke alarms high on walls or ceilings remember smoke rises.
On site it would simply result in making sure every spot on the ceiling is within 21 feet of a smoke detector.
Experts say photoelectric smoke detectors generally won t cause as many false alarms but for the ultimate in safety they recommend opting for a smoke detector with both types of sensors.
10 cm from side walls.
The maximum distance is 12 inches.
Alternate heat detector coverage configurations listed spacing 30 ft.
With heat detectors this figure is 7 5m x 7 5m giving an area of coverage of 56m per device which is rounded down to 50m.
When using the side wall mount the device no closer than 4 inches from the ceiling.
The detector may be placed on the ceiling.
If you have ceilings that are pitched install the alarm within 3 feet of the peak but not within the apex of the peak four inches down from the peak.
Wall mounted alarms should be installed not more than 12 inches away from the ceiling to the top of the alarm.
Wall mounted alarms should be installed not more than 12 inches away from the ceiling to the top of the alarm.
Many smoke detectors are designed to mount to a ceiling but some can also be wall mounted when attaching to a ceiling isn t feasible such as when it would be impossible to retrofit the wires.
Do not place the detector right next to or over a fireplace or flame producing appliance.
Mount smoke alarms high on walls or ceilings remember smoke rises.
When installed on the ceiling spot type heat detectors must be located a minimum of 4 in.
