ASHRAE+62.1-2022+(1) - Page 017
Extracted Content
5.19 Access for Inspection, Cleaning, and Maintenance 5.19.1 Equipment Clearance. Ventilation equipment shall be installed with working space that will allow for inspection and routine maintenance, including filter replacement and fan belt adjustment and replacement.
5.19.2 Ventilation Equipment Access. Access doors, panels, or other means shall be provided and sized to allow unobstructed access for inspection, maintenance, and calibration of all ventilation system components for which routine inspection, maintenance, or calibration is necessary. Ventilation system components include air-handling units, fan-coil units, water-source heat pumps, other terminal units, controllers, and sensors.
5.19.3 Air Distribution System. Access doors, panels, or other means shall be provided in ventilation equipment, ductwork, and plenums, located and sized to allow convenient and unobstructed access for inspection, cleaning, and routine maintenance of the following:
a. Outdoor air intake areaways or plenums b. Mixed-air plenums c. Upstream surface of each heating, cooling, and heat-recovery coil or coil assembly having a total of four
rows or fewer d. Both upstream and downstream surface of each heating, cooling, and heat-recovery coil having a total of
more than four rows, and air washers, evaporative coolers, heat wheels, and other heat exchangers e. Air cleaners f. Drain pans and drain seals g. Fans h. Humidifiers
5.20 Legionella Risk. The building owner shall be provided with written documentation of the design information for all of the HVAC-related water systems and elements that are required to be addressed by ANSI/ASHRAE Standard 188.
Informative Note: Typical elements of the HVAC system addressed by Standard 188 include open- and closed-circuit cooling towers and evaporative condensers that provide cooling or refrigeration for the HVAC system and humidification systems. This requirement is related to HVAC’s influence on Legionnaires’ Disease risk, but it is important to note that there are multiple sources of potential water-to-people transmission inside buildings that are potable-water-based, such as shower heads, some humidifiers, and ice machines, as well as nonpotable sources that are not associated with HVAC, such as decorative water features.
6. PROCEDURES
6.1 General. The Ventilation Rate Procedure (VRP), the Indoor Air Quality Procedure (IAQP), the Natural Ventilation Procedure, or a combination thereof shall be used to meet the requirements of this section. In addition, the requirements for exhaust ventilation in Section 6.5 shall be met regardless of the method used to determine minimum outdoor airflow rates.
Informative Note: Although the intake airflow determined using each of these approaches may differ significantly because of assumptions about the design, any of these approaches is a valid basis for design.
6.1.1 Ventilation Rate Procedure. The prescriptive design procedure presented in Section 6.2, in which outdoor air intake rates are determined based on space type/application, occupancy level, and floor area, shall be permitted to be used for any zone or system.
6.1.2 Indoor Air Quality Procedure. The IAQP is an alternative to the VRP used to determine the design rate of outdoor airflow to maintain concentrations of design compounds (DCs) and PM2.5 in the indoor environment to be less than design limits (DLs), based on indoor and outdoor sources, air cleaning, and other variables. These outdoor air requirements shall be calculated with mass-balance equations. Verification of occupant satisfaction and indoor DC concentrations shall be performed after the building is completed.
6.1.3 Natural Ventilation Procedure. The prescriptive or engineered system design procedure presented in Section 6.4, in which outdoor air is provided through openings to the outdoors, shall be permitted to be used for any zone or portion of a zone in conjunction with mechanical ventilation systems in accordance with Section 6.4.
6.1.4 Outdoor Air Treatment. Each ventilation system that provides outdoor air shall comply with Sections 6.1.4.1 through 6.1.4.4.
Exception to 6.1.4: Systems supplying air for enclosed parking garages, warehouses, storage rooms, jan itor’s closets, trash rooms, recycling areas, shipping/receiving/distribution areas.
Informative Note: Occupied spaces ventilated with outdoor air that is judged to be unacceptable are subject to reduced air quality when outdoor air is not cleaned prior to introduction to the occupied spaces.
ANSI/ASHRAE Standard 62.1-2022 15