D.C. Mun. Regs. tit. 12, r. 12-K803

Current through Register Vol. 71, No. 49, December 6, 2024

Rule 12-K803 - HVAC SYSTEMS

Strike Section 803.1.2.1 of the International Green Construction Code in its entirety and insert new Section 803.1.2.1 in the Green Construction Code in its place to read as follows:

803.1.2.1

Ventilation. Ventilation during construction shall be achieved through openings in the building envelope using one or more of the following methods:

1. Natural ventilation in accordance with the provisions of the Building Code or the Mechanical Code.

2. Fans that produce a minimum of three air changes per hour.

3. Exhaust in the work area at a rate of not less than 0.05 cfm/ft² (0.24 L/s/in²) and not less than 10 percent greater than the supply air rate so as to maintain negative pressurization of the space.

Exception: For interior tenant alterations that cannot meet ventilation requirements, other air quality measures shall be used to control emissions sources and improve air quality. Measures are allowed to include portable filtration units, sweeping compounds, point source filtration at cutting and grinding operations, vacuum drywall sanding, low-dust drywall compounds, and other measures acceptable to the code official and as outlined in the Construction Phase Indoor Air Quality Management Plan.

Strike Section 803.2 of the International Green Construction Code in its entirety without substitution.

803.2

Thermal environmental conditions for human occupancy. [Deleted]

Strike Sections 803.3 and 803.3.1 of the International Green Construction Code in their entirety without substitution.

803.3

Isolation of pollution sources. [Deleted]

803.3.1

Printer, copier and janitorial rooms. [Deleted]

Strike Sections 803.4 and 803.4.1 of the International Green Construction Code in their entirety and insert new Sections 803.4 and 803.4.1 in their place in the Green Construction Code to read as follows:

803.4

Isolation of pollutant sources. The isolation of pollutant sources related to print, copy and janitorial rooms shall be in accordance with Section 803.4.1.

803.4.1

Printer, copier and janitorial rooms. Enclosed rooms or spaces that are that are used primarily as a print or copy facility containing five or more printers, copy machines, scanners, facsimile machines, 3D printers, or similar machines in any combination, and rooms used primarily as janitorial rooms or closets where the use or storage of chemicals occurs, shall comply with all of the following:

1. The enclosing walls shall extend from the floor surface to the underside of the floor, roof deck or solid ceiling above and shall be constructed to resist the passage of airborne chemical pollutants and shall be constructed and sealed as required for 1-hour fire-resistance-rated construction assemblies. Alternatively, for janitorial rooms and closets, all chemicals shall be stored in approved chemical safety storage cabinets.

2. Doors in the enclosing walls shall be automatic or self-closing.

3. An HVAC system shall be provided that:

3.1 Provides exhaust airflow to the outdoors at a rate of not less than 0.50 cfm per square foot (2.4 L/s/m²);

3.2 Maintains a negative pressure of not less than 7 Pa (0.146 Psf) within the room; and

3.3 Prohibits the recirculation of air from the room to other portions of the building.

Strike Section 803.5 of the International Green Construction Code in its entirety and insert new Section 803.5 in the Green Construction Code to read as follows:

803.5

Filters. Filters for air conditioning systems that serve occupied spaces and handle a component of outdoor air shall be rated at MERV 11 or higher, in accordance with ASHRAE Standard 52.2, and system equipment shall be designed to be compatible. The air handling system design shall account for pressure drop across the filter. Filter performance shall be shown on the filter manufacturer's data sheet.

D.C. Mun. Regs. tit. 12, r. 12-K803

Final Rulemaking published at 67 DCR 5679 (5/29/2020)