ID#10247 made on
EQp1 - Minimum indoor air quality performance
LEED BD+C: New Construction, LEED BD+C: Core and Shell, LEED BD+C: Schools, LEED BD+C: Retail, LEED BD+C: Healthcare, LEED ID+C: Commercial Interiors, LEED ID+C: Retail, LEED O+M: Existing Buildings
For a project in Germany, the design team chose to follow the Alternative Compliance Path (ACP) Option 1 using the two European standards EN 15251 and EN 13779 in lieu of ASHRAE 62.1-2007. EN 15251 i...
For a project in Germany, the design team chose to follow the Alternative Compliance Path (ACP) Option 1 using the two European standards EN 15251 and EN 13779 in lieu of ASHRAE 62.1-2007. EN 15251 includes three categories of indoor air quality and recommends Category II for typical new construction and major renovation projects. EN 15251 also includes three categories for low-emitting buildings, depending on material selection. Since the project will pursue a minimum of 3 of the credits under IEQc4 Low-Emitting Materials, typical new construction projects should apply either the “Low Emitting Buildings” category or the “Very Low Emitting Buildings” category. The two standards, EN 15251 and EN 13779, provide minimum outside air rates for most spaces but refers to local codes for certain specialty spaces such as parking garages. Confirmation of compliance for the approach applied for these types of spaces is sought.
The application of local codes on the current project applies to garage spaces. As EN 15251 and EN 13779 refer to local codes for garages, the applicable exhaust rates for parking garages were therefore selected per Teil 5 Garagen (“Section 5 - Parking Garages”) of the Verordnung über Bau und Betrieb von Sonderbauten - Nordrhein-Westfalen (“Local Law of North Rhine-Westphalia for the Construction and Operation of Specialty Buildings”), dated 17 November 2009 (SBauVO). The SBauVO prescribed rates vary slightly from those required by ASHRAE 62.1, however, SBauVO also requires the installation of carbon monoxide (CO) detectors to limit the CO concentration to 100 ppm. As this monitoring requirement not only ensures fresh air provision it also guarantees indoor air quality, the project team seeks confirmation that the combination of exhaust rates and CO monitoring as per SBauVO meets the intent of the prerequisite to enhance indoor air quality and occupant comfort and well-being.
The applicant is requesting clarification for a project located in Germany to use the European EN-Standard 13779, Annex B of EN 15251 and a local code, Teil 5 Garagen (“Section 5 - Parking Garages”) of the Verordnung über Bau und Betrieb von Sonderbauten - Nordrhein-Westfalen (“Local Law of North Rhine-Westphalia for the Construction and Operation of Specialty Buildings”), dated 17 November 2009 (SBauVO) to show compliance with IEQp1: Minimum IAQ Performance. The proposed approach for standard spaces such as offices, conference rooms, retail areas, etc to base the ventilation requirements on EN 15251 and EN 13779, Category II is acceptable. With regards to the requirements of the EN Standards for parking garages, it will be necessary to document the calculation of the ventilation rate required for “Other known emissions” in EN Standard 13779, Section 22.214.171.124 as referenced from Section 7.4.3 (Extract Air Flow Rates). Provide the basis for all assumptions related to the mass flow rate of emission in the garage, and the allowed concentration in the garage. Specifically, the assumption should indicate the maximum number of cars that are expected to be operating in the garage at any given time, the CO emission rates associated with the average car exhaust for the average car, and the CO levels that are considered “safe” for the garage. In the absence of local requirements related to the CO levels that are considered “safe”, use the American Conference of Governmental Industrial Hygienists Threshold Limit Value (TLV) of 25 parts per million (29 mg/m3 ). If it can be demonstrated that the local code, SBauVO, is at least as stringent as EN 13779, the project team may follow the local code. However, specific information to document that the relative stringency of the EN standard and local code must be demonstrated. Applicable Internationally; Germany.
Related Addenda (Corrections & Interpretations)