Loading...
801.18.1 Size.
The chimney or vent shall be resized as necessary to control flue gas condensation in the interior of the chimney or vent and to provide the appliance or appliances served with the required draft. For the venting of oil-fired appliances to masonry chimneys, the resizing shall be in accordance with NFPA 31.
801.18.2 Flue passageways.
The flue gas passageway shall be free of obstructions and combustible deposits and shall be cleaned if previously used for venting a solid or liquid fuel-burning appliance or fireplace. The flue liner, chimney inner wall or vent inner wall shall be continuous and shall be free of cracks, gaps, perforations or other damage or deterioration which would allow the escape of combustion products, including gases, moisture and creosote. Where an oil-fired appliance is connected to an existing masonry chimney, such chimney flue shall be repaired or relined in accordance with NFPA 31.
801.18.3 Cleanout.
Masonry chimneys shall be provided with a cleanout opening complying with Section 801.13.
801.18.4 Clearances.
Chimneys and vents shall have airspace clearance to combustibles in accordance with the New York City Building Code and the chimney or vent manufacturer's instructions.
Exception: Masonry chimneys without the required airspace clearances shall be permitted to be used if lined or relined with a chimney lining system listed for use in chimneys with reduced clearances in accordance with UL 1777 or ULC-S635. The chimney clearance shall be not less than permitted by the terms of the chimney liner listing and the manufacturer's instructions.
801.18.4.1 Fireblocking.
Noncombustible fireblocking shall be provided in accordance with the New York City Building Code.
801.19 Multistory prohibited.
Common venting systems for appliances located on more than one floor level shall be prohibited.
801.20 Reserved.
801.21 Termination requirements.
Terminations shall comply with the appliance listing and manufacturer's instructions, and the following:
1. Chimneys, vents and flues serving appliances or fireplaces with outlet temperatures less than 600°F (315.6°C) shall extend at least 3 feet (914.4 mm) above the highest construction, such as a roof ridge, parapet wall or penthouse within 10 feet (3048 mm) of the chimney vent or flue outlet, whether the construction is on the same building as the chimney or on another building. Any chimneys, vents or flues located in an area that is more than 10 feet (3048 mm) from such construction, but not more than the distance determined by Equation 8-1, shall be at least as high as the highest construction in such area. For purposes of determining the required height of a chimney, such construction shall not include other chimneys, vents or open structural framing.
2. Chimneys serving appliances or fireplaces with outlet temperatures between 600°F (315.6°C) and 1,000°F (537.8°C) shall extend at least 10 feet (3048 mm) above the highest construction, such as a roof ridge, or parapet wall or penthouse within 20 feet (6096 mm) of the chimney outlet, whether the construction is on the same building as the chimney or on another building. Any chimneys located in an area more than 20 feet (6096 mm) from such construction, but not more than the distance determined from Equation 8-1, shall be at least as high as the highest construction in such area. For purposes of determining the required height of the chimney, such construction does not include other chimneys, vents or open structural framing.
3. Chimneys serving appliances or fireplaces with outlet temperatures greater than 1,000°F (537.8°C) shall extend at least 20 feet (6096 mm) above the highest construction, such as roof ridge, parapet wall, penthouse, or other obstruction within 50 feet (15 240 mm) of the chimney outlet, whether the construction is on the same building as the chimney or in another building. Any chimneys located in an area that is more than 50 feet (15 240 mm) from such construction, but not more than the distance determined from Equation 8-1, shall be at least as high as the highest construction located in such area. For purposes of determining the required height of the chimney, such construction does not include other chimneys, vents, or open structural framing.
4. Termination caps shall not be permitted. A drain shall be installed in accordance with Section 801.22. A positive means shall be provided to prevent water from entering the appliance.
Exception: Termination caps shall be permitted on listed factory-built chimneys unless otherwise prohibited by the New York City Air Pollution Control Code.
5. Decorative shrouds shall not be installed at the termination of factory-built chimneys except where such shrouds are listed and labeled for use with the specific factory-built chimney system and are installed in accordance with the manufacturers' instructions.
6. The following formula shall be used in order to determine the distance referred to in Items 1, 2 and 3 of this section:
D = F x √A | (Equation 8-1) |
where:
D | = | Distance, in feet, measured from the center of the chimney, vent or flue outlet to the nearest edge of the construction. If a single chimney is divided into multiple smaller flues or chimneys, measure from the center of the chimney outlet that is closest to the nearest edge of the construction. |
F | = | Value determined from Table 801.21. |
A | = | Free area, in square inches, of chimney flue space outlet. If a single chimney is divided into multiple smaller flues or chimneys, the total aggregate free area of such flue and chimney outlets shall be used to calculate "A". |
Type of Fuel | "F" Factor | ||
600°F (315.6°C) and less | 600°F (315.6°C) to 1,000°F (537.8°C) | Greater than 1,000°F (537.8°C) | |
No. 2 Fuel Oil | 2.5 | 2.5 | 3 |
No. 4, 6 Fuel Oil, Solid Fuels | 3 | 3 | 3 |
801.22 Drains.
A drain shall be provided for all chimneys and gas vents to remove rain water and condensation. The drain shall be not less than 1 inch (25.4 mm) in diameter and shall be equipped with an appropriately-sized p-trap with automatic trap seal primer in accordance with Section 1002 of the New York City Plumbing Code or a float drain trap installed in accordance with the manufacturer's requirements. The drain shall be sized by the design engineer and shall be suitable for the chimney area. For listed chimneys and gas vents, the connection tap into the chimney shall be determined by the manufacturer and connected to the drain piping in accordance with the listing and installation instructions. On all outdoor chimneys and gas vents, the connection and drain shall be installed indoors as close as practicable to the chimney base to prevent freezing.
801.23 Draft controls.
The installation of draft controls shall comply with Sections 801.23.1 through 801.23.5.
Loading...