---
kind: "section"
citation: "14 C.F.R. § 252.9"
title: "14"
number: "252.9"
heading: "Ventilation systems."
url: "https://uscodex.org/cfr/14/252.9"
---

# §252.9. Ventilation systems.


Air carriers shall prohibit smoking whenever the ventilation system is not fully functioning. Fully functioning for this purpose means operating so as to provide the level and quality of ventilation specified and designed by the manufacturer for the number of persons currently in the passenger compartment.


## Notes

### Authority

Authority: Pub. L. 101-164; 49 U.S.C. 40102, 40109, 40113, 41701, 41702, 41706 as amended by section 708 of Pub. L. 106-181 and section 401 of Pub. L. 112-95, 41711, and 46301.

### Source

Source: Docket No. DOT-OST-2000-7473, 65 FR 36775, June 9, 2000, unless otherwise noted.