Below ceiling below ceiling below ceiling below ceiling placement wall only wall or ceiling wall or ceiling wall or ceiling wall or ceiling visible signaling appliance requirements according to the adaag ada compliant visual alarms are not required in alterations except where an existing fire alarm system is.
Ceiling mounted fire alarm.
The strobe is always located in the center of the coverage area.
Wall mounted alarms should be installed not more than 12 inches away from the ceiling to the top of the alarm.
A plan view of a ceiling mounted fire alarm notification device s coverage area shows that the coverage projects outward along the strobe s mounting surface at an equal distance on all sides creating the square coverage areas listed in nfpa 72.
Wall mounted detectors must be installed at least 4 inches from the ceiling to avoid this dead air zone.
If the ceilings are higher than 30 feet the strobes must be mounted on the wall.
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Figure a 29 8 3 1 from nfpa 72 national fire alarm and signaling code 2013.
If you have vaulted ceilings dead air can also form at the apex.
Wall mounted alarms should be installed not more than 12 inches away from the ceiling to the top of the alarm.
Ceiling mounted fire strobes should not be more than 30 feet above the floor.
Most contractors install strobe lights to comply with the national fire alarm and signaling code by simply using a combination audible visible appliance everywhere one or the other is shown on the plans.
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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.
Mount smoke alarms high on walls or ceilings remember smoke rises.
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Wall mounted fire strobes must be placed 80 to 96 inches above the floor and at least six inches from the ceiling in all non sleeping areas.
It should be obvious that if you follow this method of compliance you will either have an incorrect number of audible appliances or an incorrect number of visible appliances.
Install the alarm at least 4 inches from the peak.
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