Motors and fans shall be sized to provide the
required air movement. Motors in areas that contain flammable
vapors or dusts shall be of a type approved for such
environments. A manually operated remote control installed
at an approved location shall be provided to shut off fans or blowers in flammable vapor or dust systems. Equipment used in operations that generate explosive or flammable vapors,
fumes, or dusts shall be interlocked with the ventilation
system so that the equipment cannot be operated unless the
ventilation fans are in operation. Motors for fans used to
convey flammable vapors or dusts shall be located outside
the duct or shall be protected with approved shields and dust-proofing.
Where belts are used, they shall not enter the duct unless the belt and pulley within the duct are enclosed.
Motors and fans shall be accessible for servicing and maintenance.
Parts of fans in contact with explosive or flammable
vapors, fumes, or dusts shall be of nonferrous or
nonsparking materials or their casing shall be lined or
constructed of such material. Where the size and hardness of
materials passing through a fan are capable of producing a
spark, both the fan and the casing shall be of nonsparking
materials. Where fans are required to be spark-resistant, their
bearings shall not be within the airstream, and parts of the fan
shall be grounded. Fans in systems handling materials that
are likely to clog the blades, and fans in buffing or woodworking
exhaust systems, shall be of the radial-blade or
tube-axial type.
Equipment used to exhaust explosive or flammable vapors, fumes, or dusts shall bear an identification plate stating the ventilation rate for which the system was designed.
Fans located in systems conveying corrosives shall be of materials that are resistant to the corrosive or shall be coated with corrosion-resistant materials.
Equipment used to exhaust explosive or flammable vapors, fumes, or dusts shall bear an identification plate stating the ventilation rate for which the system was designed.
Fans located in systems conveying corrosives shall be of materials that are resistant to the corrosive or shall be coated with corrosion-resistant materials.
[BSC-CG], [DSA-SS & DSA-SS/CC] In mechanically ventilated buildings,
provide regularly occupied areas of the building with
air filtration media for outside and return air that provides at
least a Minimum Efficiency Reporting Value (MERV) of 8.
MERV 8 filters shall be installed prior to occupancy, and
recommendations for maintenance with filters of the same
value shall be included in the operation and maintenance
manual in compliance with Chapter 5, Division 5.5. of the
California Green Building Standards Code (CALGreen).
Exceptions:
Exceptions:
- An ASHRAE 10-percent to 15-percent efficiency filter shall be permitted for an HVAC unit meeting the 2013 California Energy Code having 60,000 Btu/h (17.6 kW) or less capacity per fan coil, if the energy use of the air delivery system is 0.4 W/cfm [848 W/(m3/s)] or less at design air flow.
- Existing mechanical equipment.
Installed filters shall be clearly
labeled by the manufacturer indicating the MERV rating.