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// CODE SNIPPET

17.7.6 Special Considerations

National Fire Alarm and Signaling Code 2019 of Maine > 17 Initiating Devices > 17.7 Smoke-Sensing Fire Detectors > 17.7.6 Special Considerations
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17.7.6.1 Spot-Type Detectors

17.7.6.1.1

Combination and multi-sensor smoke detectors that have a fixed-temperature element as part of the unit shall be selected in accordance with Table 17.6.2.1 for the maximum ceiling temperature expected in service.

17.7.6.1.2*

Holes in the back of a detector shall be covered by a gasket, sealant, or equivalent means, and the detector shall be mounted so that airflow from inside or around the housing does not prevent the entry of smoke during a fire or test condition.

17.7.6.2* High-Rack Storage

The location and spacing of smoke detectors for high-rack storage shall address the commodity, quantity, and configuration of the rack storage.

17.7.6.3 High Air Movement Areas

17.7.6.3.1* General

The purpose and scope of 17.7.6.3 shall be to provide location and spacing guidance for smoke detectors intended for early warning of fire in high air movement areas.

17.7.6.3.2 Location

Smoke detectors shall not be located directly in the airstream of supply registers.

17.7.6.3.3* Spacing

17.7.6.3.3.1

Smoke detector spacing shall be reduced where the airflow in a defined space exceeds 8 minutes per air change (total space volume) (equal to 7.5 air changes per hour).

17.7.6.3.3.2

Where spacing must be adjusted for airflow, spot-type smoke detector spacing shall be adjusted in accordance with Table 17.7.6.3.3.2 or Figure 17.7.6.3.3.2 before making any other spacing adjustments required by this Code.
Table 17.7.6.3.3.2 Smoke Detector Spacing Based on Air Movement (Not to Be Used for Under-Floor or Above-Ceiling Spaces)
Minutes per Air Change Air Changes per Hour Spacing per Detector
ft2 m2
1 60 125 12
2 30 250 23
3 20 375 35
4 15 500 46
5 12 625 58
6 10 750 70
7 8.6 875 81
8 7.5 900 84
9 6.7 900 84
10 6 900 84
FIGURE 17.7.6.3.3.2 High Air Movement Areas (Not to Be Used for Under-Floor or Above-Ceiling Spaces).

17.7.6.3.3.3

Air sampling or projected beam smoke detectors shall be installed in accordance with the manufacturer's published instructions.

17.7.6.3.4 HVAC Mechanical Rooms

Where HVAC mechanical rooms are used as an air plenum for return air, the spacings of smoke detectors shall not be required to be reduced based on the number of air changes.

Related Code Sections


17.7.6 Initiating Devices, Special Considerations
Combination and multi-sensor smoke detectors that have a fixed-temperature element as part of the unit shall be selected in accordance with Table ...
National Fire Alarm and Signaling Code 2019 of Maine > 17 Initiating Devices > 17.7 Smoke-Sensing Fire Detectors > 17.7.6 Special Considerations
17.7.6.3.1* Initiating Devices, General
The purpose and scope of 17.7.6.3 shall be to provide location and spacing guidance for smoke detectors intended for early warning of fire in high air ...
National Fire Alarm and Signaling Code 2019 of Maine > 17 Initiating Devices > 17.7 Smoke-Sensing Fire Detectors > 17.7.6 Special Considerations > 17.7.6.3 High Air Movement Areas > 17.7.6.3.1* General
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