(a) Labeling. Each smoke alarm required under paragraph (b) of this section must conform with the requirements of UL 217 (incorporated by reference, see §3280.4), or ANSI/UL 268 (incorporated by reference, see §3280.4), and must bear a label to evidence conformance. Combination smoke and carbon monoxide alarms shall be listed and must bear a label to evidence conformance with UL 217 and ANSI/UL 2034.

(b) Combination alarms. Combination smoke and carbon monoxide alarms shall be permitted to be used in lieu of smoke alarms. If installed, such alarms must meet location requirements for both smoke alarms and carbon monoxide alarms.

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