RULE 4905 NATURAL GAS-FIRED, FAN-TYPE RESIDENTIAL CENTRAL FURNACES
(Adopted October 20, 2005)

1.0 Purpose

The purpose of this rule is to limit NOx emissions from natural
gas-fired, fan-type residential central furnaces.

2.0 Applicability

The provisions of this rule shall apply to any person who supplies,
sells, offers for sale, installs, or solicits the installation of
natural gas-fired, fan-type residential central furnaces for use within
the District with a rated heat input capacity of less than 175,000
British thermal units per hour and, for combination heating and cooling
units, a rated cooling capacity of less than 65,000 British thermal
units per hour.

3.  Definitions

    1.  Air Pollution Control Officer (APCO): as defined in Rule 1020
        (Definitions).

    2.  Annual Fuel Utilization Efficiency: the efficiency descriptor as
        defined by Section 430.2 of the Code of Federal Regulations,
        Title 10, Part 430, Subpart A.

    3.  District: as defined in Rule 1020 (Definitions).

    4.  Fan-type Residential Central Furnace: a self-contained space
        heater providing for circulation of heated air at pressures
        other than atmospheric through ducts more than 10 inches in
        length.

    5.  Heat Output (Central Furnace): the product obtained by
        multiplying the annual fuel utilization efficiency as defined by
        Section 430.2 of the Code of Federal Regulations (CFR), Title
        10, Part 430, Subpart A, by the rated heat input capacity of the
        natural gas-fired central furnace.

    6.  Manufactured Home: as defined in 42 United States Code Section
        5402 and California Health and Safety Code Section 18007, means
        a structure, transportable in one or more sections, which, in
        the traveling mode, is eight body feet or more in width, or 40
        body feet or more in length, or, when erected on site, is 320 or
        more square feet, and which is built on a permanent chassis and
        designed to be used as a dwelling with or without a permanent
        foundation when connected to the required utilities, and
        includes the plumbing, heating, air conditioning, and electrical
        systems contained therein; except that such term shall include
        any structure which meets all the requirements of this paragraph
        except the size requirements and with respect to which the
        manufacturer voluntarily files a certification and complies with
        the standards established under this part. \"Manufactured home\"
        includes a mobilehome subject to the National Manufactured
        Housing Construction and Safety Act of 1974 (42 U.S.C., Sec.
        5401, et seq.).

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    7.  Natural Gas: a mixture of gaseous hydrocarbons containing at
        least 80 percent methane by volume, as determined according to
        Standard Method ASTM D1945-64.

    8.  NOx: any oxides of nitrogen.

    9.  Rated Cooling Capacity: the cooling capacity specified on the
        nameplate of the cooling unit. Cooling capacity is the amount of
        heat energy the cooling system can displace in one hour (British
        thermal units per hour).

    10. Rated Heat Input Capacity: the heat input capacity specified on
        the nameplate of the combustion unit. Heat input is the amount
        of energy consumed in one hour (British thermal units per hour).

4.  Exemptions

The provisions of this rule shall not apply to:

1.  Units installed in manufactured homes.

2.  Units using fuels other than natural gas.

3.  Nonfan-type residential central furnaces.

5.0 Requirements

> No person shall supply, sell, offer for sale, install, or solicit the
> installation of any natural gas-fired, fan-type residential central
> furnace for use within the District unless it has certified emissions
> of oxides of nitrogen less than or equal to 0.093 pounds per million
> BTU of heat output or 55 ppm NOx at 3.00% O~2~ stack gas by volume
> (dry).

6.  Administrative Requirements

    1.  Emission Certification

        1.  Certified emissions levels shall be demonstrated by an
            emission certification approved under any of the following:

> 6 .1.1.1 Certification testing as described in Section 6.2 of this
> rule.

2.  The South Coast Air Quality Management District Certification List
    for Rule 1111 (NOx Emissions From Natural-gas-fired, Fan-type
    Central Furnaces).

> 6.1.1.3 Other emission certification programs approved by the APCO and
> the United States Environmental Protection Agency.

1.  The central furnace manufacturer shall display the model number of
    the appliance complying with Section 5.0 on the shipping carton and
    the rating plate of the appliance.

2.  Upon request of the APCO, each manufacturer shall submit to the
    District a statement confirming the appliance subject to this rule
    is in compliance with the emission limit specified in Section 5.0.
    The statement shall be signed, dated, and shall attest to the
    accuracy of all information. The statement shall include:

    2.  Name and address of manufacturer,

    3.  Brand name,

    4.  Model number, as it appears on the appliance rating plate,

    5.  Heat input rating, British thermal units per hour, and

    6.  A source test report verifying compliance with Section 5.0.

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1.  Certification Testing

    1.  During testing, each tested central furnace shall be operated in
        accordance with the procedures specified in 10 CFR 430, Subpart
        B, Appendix N.

    2.  Compliance with the oxides of nitrogen emission requirement in
        Section 5.0 shall be determined using California Air Resources
        Board Method 100, or United States Environmental Protection
        Agency Methods 7E and 3A.

2.  Recordkeeping

> Compliance testing records shall be maintained for five years and made
> available to the APCO upon request.

7.0 Compliance Schedule

> On and after January 1, 2007, no person shall supply, sell, offer for
> sale, install, or solicit the installation of a unit subject to this
> rule unless it meets the requirements of section 5.0.