1. (1) Vapor barrier rooms. All co-located commercial and residential perc dry cleaning facilities must be equipped with a vapor barrier room. Vapor barrier rooms must, at a minimum, enclose the perc dry cleaning equipment. They must be constructed of polyvinyl chloride, PVC sheet 22 mil thick (0.022 in.), sheet metal, metal foil faced composite board, or other equivalent materials that are impermeable to perc vapors. All joints, seams and penetrations of the vapor barrier room must be sealed except for entry doors and outside air inlet and exhaust vents. Entry doors may only be open when a person is entering or exiting the room enclosure.
2. (2) Vapor barrier room ventilation. Vapor barrier rooms must be equipped with a general exhaust ventilation system that is completely separate from the ventilation system(s) serving other areas of the building. The general exhaust ventilation system must be located near the dry cleaning machinery and in the vapor barrier room or connected to a separate room that exhausts the perc vapor emissions to the outside air. This dry cleaning general exhaust ventilation system must be operated at all times the facility is open for business and be capable of at least one air change every five minutes.

3. (3) External door fans. All third generation perc dry cleaning machines must be equipped with an external door fan. Fourth generation perc dry cleaning machines may only be equipped with an external door fan if installed prior to the effective date of this Subpart. External door fans must meet the following requirements:

   1. (i) External door fans must include a mechanical exhaust fan that is activated when the loading door is open; drawing room air from outside the loading door, through the machine drum and a carbon adsorber prior to venting outside the building. A minimum inward air velocity of 100 feet per minute must be maintained through the effective door opening area of the loading door of the machine.
   2. (ii) External door fans must not recirculate vapors into the workroom and must be properly vented to the outside air.
   3. (iii) External door fans must be controlled to a design perc emission standard of five ppm and an in-use maximum perc compliance standard of 20 ppm.

4. (4) Primary emission control systems. Refrigerated condensers must:

   1. (i) be equipped with temperature or pressure gauges to monitor performance and demonstrate compliance of the refrigerated condenser;

      1. (a) where temperature gauges are installed to demonstrate compliance, the outlet vapor temperature must be less than or equal to 45° F (7.2° C) during the final cool-down phase and lower the temperature of the air-perc vapor stream entering and exiting the refrigerated condenser by at least 20° F (11.1° C). Temperature must be measured with a graduated thermometer, thermocouple or equivalent instrument, with a minimum range from 0° F (-18° C) to 150° F (66° C) and accuracy of ±2 °F (±1.1 °C), that measures the temperature of the outlet vapor stream and is easily visible to the operator; or
      2. (b) where pressure gauges are installed to demonstrate compliance, the refrigerant high and low vapor pressures must be in the range specified in the manufacturer’s operating instructions during the heated and cool-down phases of the drying cycle;
   2. (ii) reduce the perc vapor concentration in the drum to 8600 ppm or less upon completion of the cool-down phase;
   3. (iii) be equipped with a drying sensor/controller that extends the drying time at least four minutes beyond the point where the perc recovery rate is less than 40 ml/min, or the perc vapor concentration in the drum is less than 8,600 ppm, on third and fourth generation machines installed on or after May 15, 1997; and
   4. (iv) be operated with a diverter valve where an external door fan has been installed.

5. (5) Secondary control systems. Integral carbon adsorbers must:

   1. (i) be designed to function in conjunction with a compliant primary control system;

   2. (ii) reduce the perc vapor concentration in the drum to 500 ppm or less at the immediate completion of the drying cycle and prior to the activation of any fugitive emissions control system on the following dry cleaning machines without an external door fan:

      1. (a) fourth generation machines installed on or before September 22, 1993 at major dry cleaning facilities;
      2. (b) fourth generation machines installed before May 15, 1997 at non-major dry cleaning facilities; and

   3. (iii) reduce the perc vapor concentration in the drum to 300 ppm or less at the immediate completion of the drying cycle and prior to the activation of any fugitive emissions control system on the following dry cleaning machines:

      1. (a) fourth generation machines installed after September 22, 1993 at major dry cleaning facilities;
      2. (b) fourth generation machines, installed on or after May 15, 1997, that are not equipped with an external door fan at non-major dry cleaning facilities; and

   4. (iv) be designed for non-contact steam, or hot air stripping, and must be stripped or desorbed, at least weekly and, in accordance with manufacturer's instructions.

      (b) Perc dry cleaning machines.

6. (1) New machine requirements. Only new compliant fourth generation perc dry cleaning machines that belong to equipment models previously certified by the department, or which have been issued a manufacturer's statement of compliance, may be installed and thereafter operated at stand-alone and co-located commercial facilities. No used, converted or retrofitted equipment may be installed.

7. (2) Existing machine requirements. Compliant perc dry cleaning machines and external door fans listed in subparagraph (i) or (ii) of this paragraph may be operated at the specified locations unless future operation is prohibited under section 232-2.3 of this Subpart.

   1. (i) Third generation perc dry cleaning machines that meet the control requirements of paragraph (a)(4) of this section and were retrofitted with an external door fan that meets the requirements of paragraph (a)(3) of this section, may be operated at existing dry cleaning facilities.

   2. (ii) Fourth generation perc dry cleaning machines with primary and secondary control systems that meet the requirements of paragraphs (a)(4) and (5) of this section, and external door fans that meet the requirements of paragraph (a)(3) of this section, may be operated at existing dry cleaning facilities as specified in clauses (a)-(e) of this subparagraph.

      1. (a) Fourth generation machines that were converted from third generation on or before May 15, 2001.
      2. (b) Fourth generation machines that were installed before September 24, 2003.
      3. (c) External door fans retrofitted on fourth generation dry cleaning machines prior to the effective date of this Subpart.
      4. (d) Certified fourth generation machines at co-located residential facilities that were installed on or before December 21, 2005.
      5. (e) Certified fourth generation machines at stand-alone and co-located commercial facilities that were installed prior to the effective date of this Subpart.

(a) Specific equipment standards and emission control specifications.