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.

BAS-APG001-EN

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Trane Engineered Smoke Control System for Tracer Summit manual Recommended minimum pressure difference, Minimum pressure

BAS-APG001-EN, Engineered Smoke Control System for Tracer Summit specifications

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