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Fi90a 2012

These three documents summarize formal interpretations of NFPA 90A standards regarding return air locations, corridor pressurization, and venting gas boilers in environmental air shafts. The interpretations indicate that one return air point with multiple supplies is acceptable. Pressurization differences can allow makeup air through corridor door clearances. And venting gas boilers directly into air shafts is prohibited.

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30 views3 pages

Fi90a 2012

These three documents summarize formal interpretations of NFPA 90A standards regarding return air locations, corridor pressurization, and venting gas boilers in environmental air shafts. The interpretations indicate that one return air point with multiple supplies is acceptable. Pressurization differences can allow makeup air through corridor door clearances. And venting gas boilers directly into air shafts is prohibited.

Uploaded by

hany
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Formal Interpretation

NFPA 90A
Standard for the Installation of Air-Conditioning
and Ventilating Systems
2012 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 corri-
dor?

Answer: No.

Question No. 2: Is one point of return air with multiple supply air locations as indicated on the at-
tached sketch acceptable?

Answer: Yes.

Issue Edition: 2002


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

Copyright © 2011 All Rights Reserved


NATIONAL FIRE PROTECTION ASSOCIATION
Formal Interpretation

NFPA 90A
Standard for the Installation of Air-Conditioning
and Ventilating Systems
2012 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 © 2011 All Rights Reserved


NATIONAL FIRE PROTECTION ASSOCIATION
Formal Interpretation

NFPA 90A
Standard for the Installation of Air-Conditioning
and Ventilating Systems
2012 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 © 2011 All Rights Reserved


NATIONAL FIRE PROTECTION ASSOCIATION

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