FIRE PROTECTION AND SMOKE CONTROL
General. Comply with MIL-HDBK-1008B. This is one
phase of the HVAC design effort when the designer should consult
early and often with the architectural designer to obtain
locations and ratings of firewalls, ceiling assemblies, exit
pathways, smoke barrier partitions, shafts, stairwells, etc. It
is also the time to establish which codes and which provisions of
these codes will apply.
System Design. Comply with NFPA 90A and NFGS-15971 or
NFGS-15972. Some general references that should be followed are
Ceiling plenums of the HVAC system shall conform to
b) Follow applicable NFPA codes for exit corridors.
Do not use the corridor for air movement for an HVAC system.
c) Put fire dampers in firewall and rated ceiling
openings, and smoke dampers at smoke barriers.
Put vertical ducts in rated shafts.
e) Systems 15,000 cfm and over shall have automatic
fan shutdown activated by smoke detectors in the supply duct
downstream of the filter and in the return duct system at each
f) Systems of 15,000 cfm and over shall also have
supply air and return air smoke dampers to isolate air handling
equipment from the occupied space.
g) Fire dampers and smoke detectors need access doors
in the ducts.
h) Smoke detectors are required in the supply air of
HVAC systems from 2,000 to 15,000 cfm for child care centers,
schools, brigs, hospitals, and others buildings where people
congregate. Do not use firestats.
I) Note that the above requirements will change if the
designer provides an engineered smoke control system.
For engineered smoke control systems, refer to