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// CODE SNIPPET

402.1 Occupiable Spaces

California Mechanical Code 2016 > 4 Ventilation Air > 402.0 Ventilation Air > 402.1 Occupiable Spaces
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Occupiable spaces listed in Table 402.1 shall be designed to have ventilation (outdoor) air for occupants in accordance with this chapter. Ventilation air supply requirements for occupancies regulated by the California Energy Commission are found in the California Energy Code.

TABLE 402.1
MINIMUM VENTILATION RATES IN BREATHING ZONE1, 2, 4
[ASHRAE 62.1: TABLE 6.2.2.1]
Note: Ventilation air supply requirements for occupancies regulated by the California Energy Commission are found in the California Energy Code.
OCCUPANCY CATEGORY4 PEOPLE OUTDOOR
Air Rate RP(cfm/person)
AREA OUTDOOR
Air Rate RA(cfm/ft2)
DEFAULT OCCUPANT
Density3 (people/1000 ft3)
AIR CLASS
CORRECTIONAL FACILITIES
Booking/waiting 7.5 0.06 50 2
Cell 5 0.12 25 2
Day room 5 0.06 30 1
Guard stations 5 0.06 15 1
EDUCATIONAL FACILITIES
Art classroom 10 0.18 20 2
Classrooms (ages 5-8) 10 0.12 25 1
Classrooms (age 9 plus) 10 0.12 35 1
Computer lab 10 0.12 25 1
Daycare (through age 4) 10 0.18 25 2
Daycare sickroom 10 0.18 25 3
Lecture classroom 7.5 0.06 65 1
Lecture hall (fixed seats) 7.5 0.06 150 1
Media centera 10 0.12 25 1
Multi-use assembly 7.5 0.06 100 1
Music/theater/dance 10 0.06 35 1
Science laboratories 10 0.18 25 2
University/college laboratories 10 0.18 25 2
Wood/metal shop 10 0.18 20 2
FOOD AND BEVERAGE SERVICE
Bars, cocktail lounges 7.5 0.18 100 2
Cafeteria/fast food dining 7.5 0.18 100 2
Kitchen (cooking) 7.5 0.12 20 2
Restaurant dining rooms 7.5 0.18 70 2
GENERAL
Break rooms 5 0.06 25 1
Coffee stations 5 0.06 20 1
Conference/meeting 5 0.06 50 1
Corridors – 0.06 – 1
Occupiable storage rooms for liquids or gels b 5 0.12 2 2
HOTELS, MOTELS, RESORTS, DORMITORIES
Barracks sleeping areas 5 0.06 20 1
Bedroom/living room 5 0.06 10 1
Laundry rooms, central 5 0.12 10 2
Laundry rooms within dwelling units 5 0.12 10 1
Lobbies/pre-function 7.5 0.06 30 1
Multipurpose assembly 5 0.06 120 1
OFFICE BUILDINGS
Breakrooms 5 0.12 50 1
Main entry lobbies 5 0.06 10 1
Occupiable storage rooms for dry materials 5 0.06 2 1
Office space 5 0.06 5 1
Reception areas 5 0.06 30 1
Telephone/data entry 5 0.06 60 1
MISCELLANEOUS SPACES
Bank or bank lobbies 7.5 0.06 15 1
Bank vaults/safe deposit 5 0.06 5 2
Computer (not printing) 5 0.06 4 1
Freezer and refrigerated spaces (<50°F) e 10 – – 2
General manufacturing (excludes heavy industrial and processes using chemicals) 10 0.18 7 3

TABLE 402.1 (continued)
MINIMUM VENTILATION RATES IN BREATHING ZONE1, 2
[ASHRAE 62.1:TABLE 6.2.2.1]

OCCUPANCY CATEGORY4 PEOPLE OUTDOOR
Air Rate RP(cfm/person)
AREA OUTDOOR
Air Rate RA(cfm/ft2)
DEFAULT OCCUPANT
Density3 (people/1000 ft2)
AIR CLASS
Pharmacy (prep. area) 5 0.18 10 2
Photo studios 5 0.12 10 1
Shipping/receivingb 10 0.12 2 2
Sorting, packing, light assembly 7.5 0.12 7 2
Telephone closets – – – 1
Transportation waiting 7.5 0.06 100 1
Warehousesb 10 0.06 – 2
PUBLIC ASSEMBLY SPACES
Auditorium seating area 5 0.06 150 1
Courtrooms 5 0.06 70 1
Legislative chambers 5 0.06 50 1
Libraries 5 0.12 10 1
Lobbies 5 0.06 150 1
Museums (children’s) 7.5 0.12 40 1
Museums/galleries 7.5 0.06 40 1
Places of religious worship 5 0.06 120 1
RESIDENTIAL
Common corridors – 0.06 – 1
Dwelling unitf, g 5 0.06 See footnotef 1
RETAIL
Sales (except as below) 7.5 0.12 15 2
Barber shop 7.5 0.06 25 2
Beauty and nail salons 20 0.12 25 2
Coin-operated laundries 7.5 0.12 20 2
Mall common areas 7.5 0.06 40 1
Pet shops (animal areas) 7.5 0.18 10 2
Supermarket 7.5 0.06 8 1
SPORTS AND ENTERTAINMENT
Bowling alley (seating) 10 0.12 40 1
Disco/dance floors 20 0.06 100 2
Gambling casinos 7.5 0.18 120 1
Game arcades 7.5 0.18 20 1
Gym, sports arena (play area)e 20 0.18 7 2
Health club/aerobics room 20 0.06 40 2
Health club/weight rooms 20 0.06 10 2
Spectator areas 7.5 0.06 150 1
Stages, studiosd 10 0.06 70 1
Swimming (pool & deck)c – 0.48 – 2
For SI units: 1 cubic foot per minute = 0.0283 m3/min, 1 square foot = 0.0929 m2

Notes:
1   This table applies to no-smoking areas. Rates for smoking-permitted spaces shall be determined using other methods.
2   Volumetric airflow rates are based on an air density of 0.075 pounds of dry air per cubic foot (lbda/ft3) (1.201 kgda/m3), which corresponds to dry air at a barometric pressure of 1 atm (101 kPa) and an air temperature of 70°F (21°C). Rates shall be permitted to be adjusted for actual density but such adjustment is not required for compliance with this chapter.
3   The default occupant density shall be used where actual occupant density is not known.
4   Where the occupancy category for a proposed space or zone is not listed, the requirements for the listed occupancy category that is most similar in terms of occupant density, activities, and building construction shall be used.

ITEM-SPECIFIC NOTES FOR TABLE 402.1
a   For high school and college libraries, use values shown for Public Assembly Spaces - Libraries.
b   Rate is capable of not being sufficient where stored materials include those having potentially harmful emissions.
c   Rate does not allow for humidity control. Additional ventilation or dehumidification shall be permitted to remove moisture. "Deck area" refers to the area surrounding the pool that would be expected to be wetted during normal pool use, i.e., where the pool is occupied. Deck area that is not expected to be wetted shall be designated as a space type (for example, "spectator area").
d   Rate does not include special exhaust for stage effects, e.g., dry ice vapors, smoke.
e   Where combustion equipment is intended to be used on the playing surface or in the space, additional dilution ventilation, source control, or both shall be provided.
f   Default occupancy for dwelling units shall be two persons for studio and one-bedroom units, with one additional person for each additional bedroom.
g   Air from one residential dwelling shall not be recirculated or transferred to other spaces outside of that dwelling.

402.1.1 Construction Documents

The outdoor air ventilation rate and air distribution assumptions made in the design of the ventilation system shall be clearly identified on the construction documents.

402.1.2 Dwelling

Requirements for ventilation air rate for single-family dwellings shall be in accordance with this chapter or ASHRAE 62.2.

402.1.3 Ventilation in Health Care Facilities

Mechanical ventilation for health care facilities shall be designed and installed in accordance with this code and ASHRAE 170-2013, through Addendum ae, as published with “Guidelines for Design and Construction of Hospitals and Outpatient Facilities,” 2014 edition (published by The Facility Guidelines Institute). All supply-air, return air, and exhaust-air systems shall comply with ASHRAE 170. The text of ASHRAE 170 shall be modified as follows:
  1. ASHRAE 170. Section 6.1.2.1 -- Not adopted.
  2. ASHRAE 170. Section 6.3.2 -- Not adopted.
  3. ASHRAE 170. Table 6.4 - Not adopted.
  4. ASHRAE 170. Section 6.4-6.4.4 -- Not adopted.
  5. ASHRAE 170. Section 6.9 -- Not adopted.
  6. ASHRAE 170. Section 7.1a -- Modify as follows:
    Replace reference to Table 7.1 with reference to Table 4-A.
  7. ASHRAE 170. Section 7.2.1a through e -- Not adopted.
  8. ASHRAE 170. Section 7.2.2 a through c, and e -- Not adopted
  9. ASHRAE 170. Section 7.2.3 -- Not adopted.
  10. ASHRAE 170. Section 7.3.1 -- Modify as follows:
    Replace reference to Table 7.1 with reference to Table 4-A.
  11. ASHRAE 170. Section 7.4.1 -- Modify as follows:
    Delete the Exception that allows for high return grilles.
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