Trane Engineered Smoke Control System for Tracer Summit, BAS-APG001-EN Methods of smoke control

Methods of smoke control

Figure 1: Sample pressure difference across a barrier

Table 1 provides the National Fire Protection Association (NFPA) recommended minimum pressure difference between the high-pressure side and the low-pressure side.

Table 1: Recommended minimum pressure difference

		Minimum pressure
	Ceiling height	difference
Building type	(ft [m])	(In.w.c. [Pa])
Sprinklered	Any	0.05 (12.4)
Non-sprinklered	9 (2.7)	0.10 (24.9)
Non-sprinklered	15 (4.6)	0.14 (34.8)
Non-sprinklered	21 (6.4)	0.18 (44.8)

Notes:

• The minimum pressure difference column provides the pressure difference between the high pressure side and the low-pressure side.

• The minimum pressure difference values incorporate the pressure induced by the buoyancy of hot smoke.

• A smoke control system should maintain the minimum pressure differences regardless of stack effect and wind.

• The minimum pressure difference values are based on recommendations in NFPA 92A (NFPA 2000, Recommended Practice for Smoke Control Systems).

• In.w.c. is inches of water column.

• Pa is Pascals.

Table 2 on page 4 provides the NFPA recommended maximum allowable pressure difference across doors. The listed pressure differences take into account the door closer force and door width.

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