1105.6.3.2 Quantity-emergency conditions.

Upon actuation of the refrigerant detector required in Section 1105.3, the mechanical ventilation system shall exhaust air from the machinery room in the following quantity:

Q = 100 x √G         (Equation 11-2)

For SI: Q = 0.07 x √G

Where:

   Q = The airflow in cubic feet per minute (m 3 /s).

   G = The design mass of refrigerant in pounds (kg) in the largest system, any part of which is located in the machinery room

1105.7 Termination of relief devices.

In addition to the requirements of Section 9.7.8 of ASHRAE 15, pressure relief devices, fusible plugs and purge systems located within the machinery room shall terminate outside of the structure at a location not less than 15 feet (4572 mm) above the adjoining grade level and not less than 20 feet (6096 mm) from any window, ventilation opening or exit.

1105.7.1 Discharge of Group A2, B2, A3 and B3 refrigerants.

Discharge of systems containing Group A2 or B2 refrigerants shall be acceptable to the commissioner. Discharge of systems containing Group A3 or B3 refrigerants shall be subject to the approval of the commissioner and the Commissioner of the Fire Department. Nothing in this section shall be construed to approve the use of Group A3 and B3 refrigerants if otherwise prohibited.

1105.7.2 Certificate of qualification.

Discharge of pressure relief devices, fusible plugs and purge systems for refrigerating systems containing flammable, toxic and highly toxic refrigerants and ammonia shall comply with Section 606 of the New York City Fire Code. 

1105.8 Ammonia discharge.

Pressure relief valves for ammonia systems shall discharge in accordance with ASHRAE 15.