Rule 402  Exemptions to Rule 401.  An Authority to Construct
          shall not be required for:

     A.   1.   Vehicles as defined by the Vehicle Code of the
               State of California.

          2.   Vehicles other than those contained within the
               provisions of subsection 1. above used to
               transport passengers or freight.

          3.   The exemption allowed under this Section shall not
               be extended to include any article, machine,
               equipment, or other contrivance mounted on such
               vehicle contained within the provisions of
               subsection 1. and 2. above that would otherwise
               require an Authority to Construct under the
               provisions of this Regulation.

     B.   Equipment utilized exclusively in connection with any
          structure, which structure is designed for, and used
          exclusively as a dwelling for not more than two

     C.   The following equipment:

          1.   Comfort air conditioning, or comfort ventilating
               systems, which are not designed to remove air con-
               taminants generated by, or released from specific
               units or equipment.

          2.   Refrigeration units except those used as, or in
               conjunction with, air pollution control equipment.

          3.   Piston type internal combustion engines used on
               other than vehicles for transporting passengers or
               freight, and fired with natural gas or liquefied
               petroleum gas, or those having 1,000 cubic inches
               cylinder displacement or less and fired with
               diesel oil or gasoline.

          4.   Water cooling towers and water cooling ponds not
               used for evaporative cooling of water from
               barometric jets or from barometric condensers.

          5.   Equipment used exclusively for steam cleaning.

          6.   Equipment used in eating establishments for the
               purpose of preparing food for human consumption.

          7.   Equipment used exclusively to compress or hold dry
               natural gas.

     D.   The following equipment or any other exhaust system or
          collector serving exclusively such equipment:

          1.   Laboratory equipment used exclusively for chemical
               or physical analysis and bench scale laboratory

          2.   Brazing, soldering welding equipment.

     E.   Steam generators, steam superheaters, water boilers,
          water heaters, and closed heat transfer systems that
          have a maximum heat input rate of less than 50,000,000
          British Thermal Units (BTU) per hour gross, and are
          fired exclusively with one of the following:

          1.   Natural gas;

          2.   Liquefied petroleum gas;

          3.   A combination of natural gas and liquefied
               petroleum gas.

     F.   Self-propelled mobile construction equipment other than
          pavement burners.

     G.   Implements of husbandry used in agricultural

     H.   Repairs or maintenance not involving structural changes
          to any equipment for which a Permit to Operate has been

     I.   Other sources emitting less than 1 ton per year of any
          criteria pollutant or precursor which may be specified
          by the Air Pollution Control Officer.