Have you guys run into issue with co detectors being required when there is a direct vented gas or oil appliance i.e. fireplace or boiler etc.

I just ran into this the other day when the inspector came thru for a rough inspection on a new house he brought it up to me. Though he said it was not in our code but the plumbing code. Does anyone have any info or code refs on this. Thanks.

I'm in Massachusetts.

Kelley