Trane Engineered Smoke Control System Application Manual page 15

BAS-APG001-EN
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
Building type
Sprinklered
Non-sprinklered
Non-sprinklered
Non-sprinklered
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.
Methods of smoke control
Minimum pressure
Ceiling height
(ft [m])
Any
9 (2.7)
15 (4.6)
21 (6.4)
difference
(In.w.c. [Pa])
0.05 (12.4)
0.10 (24.9)
0.14 (34.8)
0.18 (44.8)
3