San Luis Obispo
County Air Pollution Control District
RULE 201 - EQUIPMENT NOT REQUIRING A PERMIT
(Adopted 8/2/76; Revised 7/5/77, 2/23/88, 11/5/91, and 4/26/95)
B. COMBUSTION AND HEAT TRANSFER EQUIPMENT
A permit shall not be required for any process, article, machine, equipment,
or other contrivance if it is listed in sections B. - N. or if uncontrolled
emissions never exceed two pounds per day unless:
a. The process, article, machine, equipment, or other contrivance is
subject to New Source Performance Standards (NSPS) or National Emission
Standards for Hazardous Air Pollutants (NESHAPS), or
b. The process, article, machine, equipment, or other contrivance emits,
in quantities determined to be appropriate for review by the APCO, substances,
identified as toxic air contaminants or which are under review as candidate
toxic air contaminants by the California Air Resources Board pursuant to
Health and Safety Code Section 39662, or
c. The APCO makes a determination that a permit shall be required because
the equipment may not operate in compliance with all district rules and
An otherwise exempt piece of equipment requires a permit if it is part
of a process that requires a permit.
The APCO may require recordkeeping to verify or maintain any exemption.
Piston type internal combustion engines with a manufacturer's maximum continuous
rating of 50 brake horsepower (bhp) or less or gas turbine engines with
a maximum heat input rate of 3,000,000 British thermal units (Btu) per
hour or less at ISO Standard Day Conditions. The ratings of all engines
or turbines used in the same process will be accumulated to determine whether
this exemption applies.
Any combustion equipment that has a maximum heat input rate of less than
2,000,000 Btu per hour (gross) and is equipped to be fired exclusively
with purchased quality natural gas, liquefied petroleum gas or any combination
thereof. The ratings of all combustion equipment used in the same process
will be accumulated to determine whether this exemption applies.
Internal combustion engines used solely as a source of standby power and
that are operated less than 100 hours per year or 1) are only used for
power when normal power line service fails, or 2) are only used for the
emergency pumping of water. This exemption does not include IC engines
used as standby power due to a voluntary reduction in power by the power
D. RESIDENTIAL STRUCTURES
Motor vehicles as defined by the Vehicle Code of the State of California
but not including any article, machine, equipment, or other contrivance
mounted on such vehicle, that would otherwise require a permit under the
provisions of these rules and regulations.
Locomotives, airplanes and watercraft used to transport passengers or freight.
This exemption is not intended to apply to equipment used for the dredging
of waterways or to equipment used in pile driving adjacent to or in waterways.
E. COOLING TOWERS
Any structure designed for and used exclusively as a dwelling for not more
than four families and any incinerator used exclusively in connection with
such a structure.
F. PRINTING AND REPRODUCTION EQUIPMENT
Water cooling towers that have a circulation rate of less than 10,000 gallons/minute
and which are not used for cooling of process water, water from barometric
jets or water from barometric condensers.
G. FOOD PROCESSING
Printing and related coating or laminating equipment not using more than
two gallons of graphic arts material per day. This exemption shall not
include equipment associated with wood flat stock coating operations.
Photographic process equipment by which an image is reproduced upon material
sensitized to radiant energy and control equipment venting exclusively
H. PLASTIC/RUBBER PROCESSING
Equipment, excluding boilers, used in eating establishments or other retail
establishments for the purpose of preparing food for human consumption.
Mixers and blenders used in bakeries where the products are edible and
intended for human consumption. Ovens at bakeries whose total production
is less than 1,000 pounds of product per operating day.
Equipment used exclusively to grind, blend or package tea, cocoa, spices
or roasted coffee and control equipment venting exclusively such equipment.
Smokehouses for preparing food in which the maximum horizontal inside cross-section
area does not exceed 20 square feet.
Barbeque equipment which is not used for commercial purposes.
Confection cookers where products are edible and intended for human consumption
and control equipment venting exclusively such equipment.
I. STORAGE AND TRANSFER EQUIPMENT
The following uncontrolled equipment or process using material containing
VOCs, when emissions of VOCs from the equipment or process do not exceed
five pounds in any one day:
a. Foam manufacturing or application
b. Fiberglass reinforced plastic fabrication
c. Plastics manufacturing
Equipment used exclusively for extruding rubber products or plastic where
no plasticizer or blowing agent is present, or for pelletizing polystyrene
foam scraps except equipment used to extrude or to pelletize acrylics,
polyvinyl chloride, polystyrene, and their copolymers.
Ovens used exclusively for the curing, softening, or annealing of plastics.
This exemption shall not apply to ovens used to cure fiberglass reinforced
J. SURFACE COATING AND CLEANING OPERATIONS
Unheated organic liquid containers with capacities of not more than 250
Mobile transport tanks or delivery tanks or cargo tanks on vehicles for
delivery of VOCs except asphalt tankers used to transport and transfer
hot asphalt for roofing applications.
Equipment used exclusively for the storage of unheated organic material
with an initial boiling point of 302o F or greater, or with
an organic vapor pressure of 0.1 psi absolute or less at 70o
F as determined by the following ASTM test methods:
a. ASTM D 2879-86, "Standard Test Method for Vapor Pressure-Temperature
Relationship and Initial Decomposition Temperature of Liquids by Isoteniscope"
b. ASTM D 1078-86, "Standard Test Method for Distillation Range of Volatile
Equipment used exclusively for the unheated underground storage of 6,077
gallons or less of organic liquids with a vapor pressure of 1.5 psi absolute
or less at actual storage conditions. Equipment used exclusively for the
transfer to or from such storage of organic liquids with a vapor pressure
of 1.5 psi absolute or less at actual storage conditions. Vapor pressure
to be determined by ASTM D 2879-86, "Standard Test Method for Vapor Pressure-Temperature
Relationship and Initial Decomposition Temperature of Liquids by Isoteniscope".
The temporary storage of gasoline in flexible containers to support equipment
responding to an emergency or for the purposes of training to support such
Equipment used exclusively for the storage and transfer of fresh, commercial
or purer grades of:
a. Sulfuric acid or phosphoric acid with an acid strength of 99 percent
or less by weight.
b. Nitric acid with an acid strength of 70 percent or less by weight.
Equipment used exclusively for the storage and transfer of liquid soaps,
liquid detergents, vegetable oils, waxes and wax emulsions.
Equipment used exclusively for the storage and transfer of lubricating
Equipment used exclusively for the storage and transfer of gasoline having
a storage capacity of less than 1,500 gallons.
K. AGRICULTURAL OPERATIONS
Application equipment for architectural surface coatings used for commercial
or residential applications.
Unheated non-conveyorized, cleaning equipment: (Does not include control
a. With an open surface area of 10.8 sq. feet or less with an internal
volume of 92.5 gallons or less, and
b. Using only organic solvents with an initial boiling point of 302
F or greater as determined by ASTM test method D 1078-86, "Standard Test
Method for Distillation Range of Volatile Organic Liquids".
c. Less than 25 gallons of solvent per year are lost to the atmosphere
from all such equipment. Solvent lost shall not include solvent that is
recycled or disposed of properly. Any person claiming exemption pursuant
to this subsection shall maintain adequate monthly records to substantiate
their exempt status.
Surface coating equipment using a combined total of one gallon per day
or less of coating material and solvent.
L. STRUCTURE AND EQUIPMENT
Any equipment used in agricultural operations in the growing of crops or
the raising of fowl or animals. This exemption is not intended to apply
to the operation of orchard and citrus grove heaters. In no event shall
a permit be denied an operator of such heaters if the heaters produce unconsumed
solid carbonaceous matter at the rate of one gram per minute or less.
M. GENERAL UTILITY EQUIPMENT
Repairs or maintenance not involving structural changes to any equipment
for which a permit has been granted.
Structural changes which cannot change the quality, nature or quantity
of air contaminant emissions.
Identical replacement in whole or in part of any article, machine, equipment
or other contrivance, where a Permit to Operate had previously been granted
for such equipment under Rule 202, Permits.
Vacuum-cleaning systems used exclusively for industrial, commercial or
residential housekeeping purposes.
Comfort air conditioning or ventilating systems which are not designed
or used to remove air contaminants generated by or released from specific
units of equipment.
Refrigeration units except those used as or in conjunction with air pollution
Equipment used exclusively for steam cleaning.
Blast cleaning equipment in which suspension of abrasive in water is used
and control equipment venting exclusively such equipment.
Equipment used exclusively for space heating other than boilers.
O. PORTABLE EMISSIONS UNITS
Equipment used exclusively for inspection of metal products and control
equipment venting exclusively such equipment.
Brazing, soldering or welding equipment and control equipment venting exclusively
Kilns used exclusively for firing ceramic ware except those fired by fuel
Equipment used exclusively for dyeing, stripping or bleaching of textiles
where no organic solvents, diluents or thinners are used.
Laundry dryers, extractors or tumblers used for fabrics cleaned only with
water solutions of bleach or detergent, and control equipment exclusively
venting such equipment.
A portable emissions unit for which a written permit is otherwise required,
shall be exempt from the permitting requirements provided that all of the
following conditions are met:
The emissions unit has a valid registration obtained in accordance with
the provisions of Rule 220, Portable Equipment Registration; and
The portable emissions unit is not subject to Rule 216, Federal Part