4.7.2 Ventilation and Exhaust

This action launches a tab edit view of the Title 24 ventilation and exhaust properties for the selected spaces in the model.

Title 24 Ventilation Properties

The following ventilation properties can be viewed / edited by the user

· Basis for OA Requirement (non editable): Type ventilation standard – set too Title 24 2022

· Title 24 Ventilation Source: Forced, natural or none

· Title 24 Ventilation Function: the ventilation function type for the space, which defines the supply airflow and exhaust airflow requirements

· Outdoor Air Req. Type: Maximum, single requirement, sum

· Outdoor Air Req (ACH): The user input outdoor air flow rate in cubic feet per hour divided by the volume of the space.

· Outdoor Air Req (cfm/per person): The user input outdoor air flow rate divided by the design or hourly occupancy of the space.

· Outdoor Air Req (cfm/ft2): The user input outdoor air flow rate divided by the floor area of the space.

· Outdoor Air Req (cfm): The user input outdoor air flow rate

· Outdoor Air Req Total (cfm): Calculated outdoor air flow rate as per the user input

· Title 24 Min Outdoor Air Req Total (cfm): The minimum required by Title 24

· Title 24 Control Method: Fixed, C02 Sensors

· Ventilation Req (cfm): Calculated outdoor air flow rate as per the user input

· Ventilation Increase (%): Increase the ventilation rate by a user input percentage

· Mx Ventilation Req (cfm): Final calculated ventilation rate

The following exhaust properties can be viewed / edited by the user:

· Use Exhaust Air Change Req?: Yes/No

· Exhaust Air Change Req: The design exhaust air flow rate in the space

· Exhaust Air Change Req Unit: The unit for the design exhaust air flow rate in the space

· Exhaust Air Change Req (cfm): The design exhaust air flow rate for the space in cfm

· Title 24 Min Exhaust Req (cfm/ft2): The Title 24 minimum exhaust air flow rate for the space in cfm/ft2

· Title 24 Min Exhaust Req (cfm): The Title 24 minimum exhaust air flow rate for the space in cfm

· Title 24 Process Exhaust: Yes/No – only applies to certain space types

o Exhaust Air section (Commercial Kitchen)

§ Exhaust Hood Style: Select the type of exhaust hood. Input is optional. Options are WallMountedCanopy, SingleIsland, DoubleIsland, Eyebrow, BackshelfOrPassover.

§ Duty: Select the type of duty. Input is optional. Options are none, light, Medium, or Heavy.

§ Length (ft): Enter length of hood in feet.

§ Flow (cfm): The air flow rate in cfm.

o Exhaust Air section (Laboratory)

§ Total Fume Hood Length: The total length of the fume hoods. This and the exhaust airflow is used to determine whether the laboratory is a fume hood intensive laboratory and subject to sash control requirements.

§ Vertical Sash Fume Hood Exh Flow: The total exhaust flow through fume hoods using vertical sashes (cfm).

§ Vertical Sash Auto. Control Fraction: the fraction of fume hoods with vertical sashes that have automatic closure control devices.

§ Total Other Exhaust Flow: Exhaust airflow from other devices.

· Use Primary Air Change Req? – Yes/No

· Nighttime Setback Percentage – Yes/No