An alternative engineered design shall comply with the intent of the provisions of this code and shall provide an equivalent level of quality, strength, effectiveness, fire resistance, durability, and safety, Material, equipment, or components shall be designed and installed in accordance with the manufacturer's installation instructions.
The registered design professional shall indicate on the design documents that the mechanical system, or parts thereof, is an alternative engineered design so that it is noted on the construction permit application. The permit and permanent permit records shall indicate that an alternative engineered design was part of the approved installation.
The registered design professional shall submit sufficient technical data to substantiate the proposed alternative engineered design and to prove that the performance meets the intent of this code.
The registered design professional shall provide two complete sets of signed and sealed design documents for the alternative engineered design for submittal to the Authority Having Jurisdiction. The design documents shall include floor plans of the work. Where appropriate, the design documents shall indicate location, sizing, and loading of appurtenances, equipment, appliances, and devices.
An approval of an alternative engineered design shall be at the discretion of the Authority Having Jurisdiction. The exercise of this discretionary approval by the Authority Having Jurisdiction shall have no effect beyond the jurisdictional boundaries of said Authority Having Jurisdiction. An alternative engineered design so approved shall not be considered as in accordance with the requirements, intent or both of this code for a purpose other than that granted by the Authority Having Jurisdiction.
The Authority Having Jurisdiction shall have the authority to require testing of the alternative engineered design in accordance with Section 302.2.1, including the authority to require an independent review of the design documents by a registered design professional selected by the Authority Having Jurisdiction and at the expense of the applicant.
The alternative engineered design shall be tested and inspected in accordance with the submitted testing and inspection plan and the requirements of this code.
This section has been amended at the state or city level.
Outside or return air for a heating or cooling air system shall not be taken from the following locations:
- Less than 10 feet (3048 mm) in distance from an appliance vent outlet, a vent opening of a plumbing drainage system, the discharge outlet of an exhaust fan, or a medical-surgical vacuum outlet unless the outlet is 3 feet (913 mm) above the outside-air inlet.
- Less than 10 feet (3048 mm) above the surface of an abutting public way, driveway, sidewalk, street, alley, or driveway.
- A hazardous or insanitary location, or a refrigeration machinery room as defined in the CMC.
- An area, the volume of which is less than 25 percent of the entire volume served by such system, unless there is a permanent opening to an area, the volume of which is equal to 25 percent of the entire volume served.
EXCEPTION: Such openings where used for a heating or cooling air system in a dwelling unit shall be permitted to be reduced to not less than 50 percent of the required area, provided the balance of the required return air is taken from a room or hall having not less than three doors leading to other rooms served by the furnace.
- A closet, bathroom, toilet room, or kitchen.
- Rooms or spaces containing a fuel-burning appliance therein, where such room or space serves as source of return-air.
- This shall not apply to fireplaces, fireplace appliances, residential cooking appliances, direct-vent appliances, enclosed furnaces, and domestic-type clothes dryers installed within the room or space.
- This shall not apply to a gravity-type or listed vented wall heating or cooling air system.
- This shall not apply to a blower-type heating or cooling air systems installed in accordance with the following requirements:
- Where the return air is taken from a room or space having a volume exceeding 1 cubic foot (0.03 m 3 ) for each 10 Btu/h (0.003 kW) fuel input rating of fuel-burning appliances therein.
- Not less than 75 percent of the supply air is discharged back into the same room or space.
- Return-air inlets shall not be located within 10 feet (3048 mm) from an appliance firebox or confined space.