Systems shall be equipped with air filters that meet either subsection i or ii below. Natural ventilation. Naturally ventilated spaces shall be designed in accordance with Floor area to be ventilated.
Spaces or portions of spaces to be naturally ventilated shall be located within a distance based on the ceiling height, as specified in i, ii and iii. The ceiling height H to be used in i, ii or iii shall be the minimum ceiling height in the space, or for ceilings that are increasing in height as distance from the operable openings is increased, the ceiling height shall be determined as the average height of the ceiling within 20 feet from the operable opening.
Ceiling height. The ceiling height h to be used in Section Control and accessibility. The means to open the required operable opening shall be readily accessible to building occupants whenever the space is occupied. Controls shall be designed to coordinate operation of the natural and mechanical ventilation systems. Exception 1 to Section Exception 2 to Section Mechanical ventilation. Occupiable spaces shall be ventilated with a mechanical ventilation system capable of providing an outdoor airflow rate V z to the zone no less than the larger of A or B as described below:.
The outdoor airflow rate to the zone V z shall be determined in accordance with Equation For spaces designed for an expected number of occupants or spaces with fixed seating, the outdoor airflow rate to the zone V z shall be determined in accordance with Equation The expected number of occupants shall be the expected number specified by the building designer. For spaces with fixed seating, the expected number of occupants shall be determined in accordance with the California Building Code.
The rate of outdoor air required by Section Operation and control requirements for minimum quantities of outdoor air. Times of occupancy. The minimum rate of outdoor air required by Section In intermittently occupied spaces that do not have processes or operations that generate dusts, fumes, mists, vapors or gasses and are not provided with local exhaust ventilation such as indoor operation of internal combustion engines or areas designated for unvented food service preparation , the rate of outdoor air may be reduced if the ventilation system serving the space is controlled by a demand control ventilation device complying with Section The rate of outdoor air provided to a space may be reduced below the level required by Section Required demand control ventilation.
Demand ventilation controls complying with Exception 3 to Section For each system with demand control ventilation DCV , CO 2 sensors shall be installed in each room that meets the criteria of Section When a zone or a space is served by more than one sensor, a signal from any sensor indicating that CO 2 is near or at the setpoint within the zone or space, shall trigger an increase in ventilation.
Demand ventilation controls shall maintain CO 2 concentrations less than or equal to ppm plus the outdoor air CO 2 concentration in all rooms with CO 2 sensors. Outdoor air CO 2 concentration shall be determined by one of the following:. Occupant sensor ventilation control devices. When occupancy sensor ventilation devices are required by Section One hour prior to normal scheduled occupancy, the occupancy sensor ventilation control shall allow pre-occupancy purge as described in Section Ducting for zonal heating and cooling units.
Where a return plenum is used to distribute outdoor air to a zonal heating or cooling unit, which then supplies the air to a space in order to meet the requirements of Section Design and control requirements for quantities of outdoor air.
Air classification and recirculation limitations. Air classification and recirculation limitations of air shall be based on the air classification as listed in Table Class 2 air. Recirculation or transfer of Class 2 air shall be permitted in accordance with Class 2 air shall not be recirculated or transferred to Class 1 spaces.
Recirculated Class 2 air shall not exceed 10 percent of the outdoor air intake flow. The three primary sets involve whole-building ventilation, local demand-controlled exhaust, and source control. The secondary requirements focus on properties of specific items needed to achieve the main objectives of the standard. This standard does not apply to transient housing such as hotels, motels, nursing homes, dormitories, or jails.
The standard considers chemical, physical, and biological contaminants that can affect air quality. MacX YouTube Downloader. Microsoft Office YTD Video Downloader. Adobe Photoshop CC. VirtualDJ Avast Free Security. WhatsApp Messenger. Talking Tom Cat. Clash of Clans. Subway Surfers. TubeMate 3. Google Play.
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