Intent 1:

To exempt certain doors from the application of Sentence (1), where

  • a vestibule is not justifiable for reasons of function,
  • the door is rarely used as a service or emergency exit door,
  • the door is only used seasonally,
  • the size of the space the door serves is sufficiently small such that the vestibule would occupy an unacceptably large part of the usable space, or
  • the building is in a warmer climate zone, and as such, a vestibule would result in minimal energy gains and is therefore not justifiable, and the building is small to mid-size making the installation of a vestibule uneconomical.

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