The permit does not apply to:
   (a)   Cooling and ventilating equipment.
      (1)   Cold storage refrigeration equipment;
      (2)   Comfort air conditioning or comfort ventilating systems not designed to remove air contaminants generated by or released from specific units of equipment;
      (3)   Natural draft hoods or natural draft ventilation;
      (4)   Water cooling towers and water cooling ponds not used for evaporative cooling of process water or not used for evaporative cooling of water from barometric jets or from barometric condensers.
   (b)   Cleaning, washing, or drying equipment.
      (1)   Vacuum cleaning systems used exclusively for industrial, commercial or residential housekeeping purposes;
      (2)   Equipment used for portable steam cleaning;
      (3)   Blast cleaning equipment using a suspension of abrasive in water and any exhaust system or collector serving them exclusively;
      (4)   Equipment used for washing or drying products fabricated from metal or glass, if no volatile organic materials are used in the process and no oil or solid fuel is burned;
      (5)   Laundry dryers, extractors or tumblers for fabrics cleaned with only water solutions of bleach or detergents.
   (c)   Furnaces, ovens and heaters.
      (1)   Natural gas fired or liquefied petroleum gas-fired or electrically heated furnaces for heat treating glass or metals, the use of which does not involve molten materials;
      (2)   Porcelain enameling furnaces or porcelain enameling drying ovens and any exhaust equipment serving them exclusively;
      (3)   Kilns for firing ceramic ware, heated exclusively by natural gas or liquefied petroleum gas or any combination thereof, or heated electrically, and any exhaust system or collector serving them exclusively;
      (4)   Blacksmith forges;
      (5)   Crucible furnaces, pot furnaces or induction furnaces, with a capacity of 1,000 pounds or less each, in which no sweating or distilling is conducted, nor any fluxing conducted utilizing free chlorine, chloride and fluoride derivatives and ammonium compounds;
      (6)   Gas fuel and No. 1 and No. 2 fuel-oil burning equipment with a maximum heat input of 100 million Btu per hour used for space heating, service water heating or electric power generation and indirect heaters used in oil and gas producing and process operations;
      (7)   Incinerators, fuel-burning and cooking equipment used in connection with a structure designed and used exclusively as a dwelling for not more than two families;
      (8)   Bakery ovens and confection cookers where the products are edible and intended for human consumption, and any exhaust system or collector serving them exclusively.
   (d)   Testing and inspection equipment.
      (1)   Laboratory equipment used exclusively for chemical or physical analysis or experimentation except that used for controlling radioactive air contaminants;
      (2)   Equipment used for hydraulic or hydrostatic testing;
      (3)   Equipment for inspection of metal products.
   (e)   Containers, reservoirs or tanks. Used exclusively for:
      (1)   Dipping operations for coating objects with oil, waxes or greases, or natural or synthetic resins containing no organic solvents;
      (2)   Electrolytic plating with, electrolytic polishing of, or electrolytic stripping of the following metals: brass, bronze, cadmium, copper, iron, lead, nickel, tin, zinc, and precious metals;
      (3)   Storage of butane, propane or liquified petroleum gas;
      (4)   Storage of lubricating oils.
   (f)   Miscellaneous.
      (1)   Maintenance structural changes or minor repairs not involving any change in the quality, nature or quantity of the emission of air contaminants therefrom;
      (2)   Equipment used for any mode of transportation;
      (3)   Internal combustion engines;
      (4)   Vacuum pumps in laboratory or pilot plant operations;
      (5)   Unheated solvent dispensing containers or unheated solvent rinsing containers of 60 gallons capacity or less;
      (6)   Portable brazing, soldering or welding equipment;
      (7)   Grain, metal or mineral extrusion presses;
      (8)   The following equipment and an exhaust system or collection serving it exclusively:
         a.   Drop hammers or hydraulic presses for forging or metal working;
         b.   Die casting machines;
         c.   Equipment for surface preparation of metals by use of aqueous solutions, except for acid solutions;
         d.   Atmosphere generators used in connection with metal heat treating processes;
         e.   Equipment used exclusively for sintering of glass or metals, but not exempting equipment used for sintering metal bearing ores, metal scale, clay, fly-ash or metal compounds;
         f.   Equipment for carving, cutting, routing, turning, drilling, machining, sawing, surface grinding, sanding, planning, buffing of polishing of ceramic art work, leather, metals, plastic, rubber, wood or wood products, on a nonproductive basis;
         g.   Photographic process equipment by which an image is reproduced upon material sensitized to radiant energy.
(Ord. 2494, passed 5-12-1975; Ord. 2501, passed 6-2-1975)