California Green Building Code (CALGreen) – Isolation of pollutant sources

These precautions are meant to lower occupant exposure to potentially dangerous fumes or chemicals in certain spaces or rooms, such as garages, cleaning or laundry rooms, and printing rooms. Additionally, it prevents dangerous effects from spreading to nearby locations.

CALGreen Code Section A5.504.5.2: Isolation of pollutant sources.

In rooms where activities produce hazardous fumes or chemicals, such as garages, janitorial or laundry rooms and copy or printing rooms, exhaust them and isolate them from adjacent rooms.

1. Exhaust each space with no air recirculation in accordance with ASHRAE 62.1/ Table 6-4, to create negative pressure with respect to adjacent spaces with doors to the room closed.

2. For each space, provide self-closing doors and deck to deck partitions or a continuous ceiling.

3. Install low-noise, vented range hoods for all cooking appliances and in laboratory or other chemical mixing areas.


The purpose of these measures is to reduce occupant exposure to hazardous fumes or chemicals in specific areas or rooms where those fumes or chemicals may be present, such as garages, janitorial or laundry rooms, and copy or printing rooms. It also limits the spread of hazardous effects to adjacent spaces.

A5.504.5.3.1 Filters, Tier 1 and A5.504. Filters, Tier 2

Compliance Method:

Identify spaces where activity may produce hazardous fumes or chemicals. Show compliance with the applicable listed requirements in the code.


Plan intake: The plan reviewer should confirm in the construction documents that applicable listed requirements are shown.

On-site enforcement: The inspector should review the project for compliance with the approved construction documents.

(Excerpted from ‘Guide to the 2022 California Green Building Standards Code Nonresidential’ – Appendix A5)

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