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This help desk is a free resource intended for discussion purposes only. Neither BOMA, its chapters, affiliates, or Extreme Measures Inc.® are responsible for the information, comments or opinions expressed herein. For complete information, refer to the official publications of the standards themselves.

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Vertical HVAC ducts

Gabriel Lopez Morton
November 23, 2021

We are working on a mixed use building ( comercial base, residential on top), how should we treat vertical HVAC ducts? Should the be considered common area? Should they be counted only once like stairs and elevators? Thank you in advance for your prompt answer. Best, Gabriel

David Fingret
Extreme Measures Inc.
November 23, 2021

Hi Gabriel,

Vertical HVAC ducts are Major Vertical Penetrations (MVP). In the 2012 Mixed-Use Standard they are either a MUCA (Mixed-Use Common Area) to be proportionately allocated to each Use-Component or they belong to a Use Component directly. Either way, MVP is not rentable area.

I'm not exactly sure what you mean by "should they be counted only once..." but the 2012 Mixed-Use Standard does not include stairs, elevators and shafts as rentable area at the lowest level like in the latest BOMA Office, Retail, and Industrial standards.


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