For extended work shifts all eight-hour PEL's shall be time-weighted to adjust for additional worker exposure during
extended work shifts.
(1) If indoor air monitoring indicates over-exposure to
contaminant PEL's, engineering controls shall be utilized to
reduce firefighter exposure to the lowest feasible level.
(2) All fixed internal combustion equipment such as, but
not limited to emergency generators, shall be effectively
exhausted to the exterior of the fire stations.
(3) All facilities dedicated to the maintenance and
repair of internal combustion equipment shall have means for
effective ventilation to the exterior of the building.
(4) All fire stations built after January 1, 1997, shall
be designed and constructed to conform to ACGIH ventilation
recommended criteria for exhaust of internal combustion
engines.
Additional reference: Industrial Ventilation Manual of
Recommended Practices ISBN No.: 0-936712-65-1.