One correction to the standard is a revision to section 5.3.2, “Equipment Located in Unconfined Spaces.” The section eliminated the option of supplying all air for combustion from inside a building in structures that are classified as “unusually tight construction.” According to NFPA, “Using section 5.3.2 (a) is not an option. All combustion air would have to be outdoor air per section 5.3.3 (b).”
Other proposed changes include eliminating the definition of confined space, unconfined space, and unusually tight construction. It would also restore an option to use indoor air for combustion air if a sufficient quantity is available.
For more information, go to www.nfpa.org (website).
Publication date: 12/17/2001