FOREWORD

This addendum adds new definitions, revises Sections 6 and 7, and adds a new Section 8 with requirements specific to multifamily buildings. The changes in requirements account for unique features of multifamily buildings as compared to single-family buildings and include (1) adjusting the whole-building ventilation rate due to the fact that infiltration cannot be relied on for individual units in multifamily buildings; (2) provision of ventilation to common spaces and common parking garages, which do not exist in single-family buildings; and (3) prevention of contaminant transfer from other units through walls or ducts.

Note: In this addendum, changes to the current standard are indicated in the text by underlining (for additions) and strikethrough (for deletions) unless the instructions specifically mention some other means of indicating the changes.