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Formal Interpretation

NFPA 90A

Standard for the Installation of Air-Conditioning and Ventilating Systems

2009 Edition Reference: 4.3.11.1 F.I. No.: 90A-02-04

Question No. 1: Is the intent of the paragraph to require multiple locations for return air in a corridor? Answer: No. Question No. 2: Is one point of return air with multiple supply air locations as indicated on the attached sketch acceptable? Answer: Yes.

Issue Edition: 2002 Reference: 4.3.11.1 Issue Date: 12/19/2007 Effective Date: 1/8/2008

Copyright © 2008 All Rights Reserved NATIONAL FIRE PROTECTION ASSOCIATION

Formal Interpretation

NFPA 90A

Standard for the Installation of Air-Conditioning and Ventilating Systems

2009 Edition

Reference: 4.3.11.1, 3.3.5 and 3.3.21 F.I. No. 90A-02-3

Question 1: When the resident's room windows are closed, can the 50cfr of air exhausted from the bathroom and drawn from the room in general be in whole or in part made up by infiltration through the NFPA 80 complying clearances around and under the corridor door due to the resultant pressure differences? Answer: Yes. Question 2: Does the corridor described constitute a plenum or air duct as these terms were intended to apply under 90A? Answer: No.

Issue Edition: 2002 Reference: 4.3.11.1, 3.3.5 and 3.3.21 Issue Date: January 24, 2006 Effective Date: February 12, 2006

Copyright © 2008 All Rights Reserved NATIONAL FIRE PROTECTION ASSOCIATION

Formal Interpretation

NFPA 90A

Standard for the Installation of Air-Conditioning and Ventilating Systems

2009 Edition Reference: 5.3.4.5 FI No. 90A-02-02

Question: Is it the intent of NFPA 90A: 5.3.4.5 to prohibit the installation of a Type B vent, which is connected to and exhausts a natural gas fire boiler within an environmental air shaft? Answer: Yes.

Issue Edition: 2002 Reference: 5.3.4.5 Issue Date: January 10, 2006 Effective Date: January 30, 2006

Copyright © 2008 All Rights Reserved NATIONAL FIRE PROTECTION ASSOCIATION

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