Cal. Code Regs. tit. 25, § 4521
All exterior openings around piping, tubing, ducts, plenums, chimneys and vents shall be sealed to resist the entrance of rodents.
Note: Authority cited: Section 18015, Health and Safety Code. Reference: Section 18025, Health and Safety Code.
1. New section filed 9-19-2011; operative 10-19-2011 (Register 2011, No. 38).