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2019 CALIFORNIA mechanical CODE CHANGE SUMMARY 

The following changes are not inclusive of all code changes.  They are a brief summary of changes that may have a significant impact on your project.

PART 4

Section

Notes

303.8

Appliances on roofs: New code requirements, including: Load capacity, fasteners and clearances.

401.2

MERV 13 filtration required in air handling units; this section has been moved from 2016 CPC §503.3 to 2019 CPC §401.2 and the rating has been increased from MERV 8 to MERV 13.

Table 403.7

New minimum ventilation rates for shower rooms now included in the code.

504.4.2.1

Clothes dryer exhaust duct power ventilator added to the code as an exception to increase the length limitation of the vent.

505.0

Product conveying exhaust systems, expanded regulation for deflagration venting, use of fire dampers, fire alarm and extinguishing systems, and inter-lock controls.

506.3

New requirement that allows exhaust ducts to penetrate fire barriers of 2 hours or more.

603.5

Added regulation for flexible air ducts.

603.10.1

Added regulation for duct leakage test.

1107.0

Added regulation for refrigeration machinery room requirements.

Chapter 13

See 2019 CA Plumbing Code Change Summary-Part 5