scope:

FOREWORD

The Indoor Air Quality Procedure (IAQP) requires that a mass balance calculation be performed. Any mass balance that includes filtration or air cleaning requires a particle filtration efficiency or gaseous removal efficiency. Addendum n requires that the efficiencies of these devices be tested to current standards. However, with no specific testing requirements, there is no assurance that designs will work.

The ASHRAE Position Document on Filtration and Air Cleaning¹ states "All filtration and aircleaning technologies should be accompanied by data documenting their performance regarding removal of contaminants; these data should be based on established industry test standards." Previous draft addenda to the standard included testing to ASHRAE standards but were viewed by some as being overly restrictive. Addendum n is more inclusive-for example, citing ISO standards. To ensure objectivity for test equipment suppliers, no specific design of the test apparatus is specified. Instead requirements of apparatus properties and validation tests are specified.

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