Blower-door estimates of PM2.5 deposition rates and penetration factors in an idealized room

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Original languageEnglish
Pages (from-to)2064-2082
Journal / PublicationIndoor and Built Environment
Issue number8
Online published11 Aug 2020
Publication statusPublished - Oct 2022


Particle deposition and penetration in buildings has been widely studied, but the effect of indoor characteristics merits further investigation, so improved experimental methods may be needed. The present study measured indoor and outdoor concentrations of PM2.5 and estimated PM2.5 deposition rates and penetration factors under a variety of different indoor situations, with a novel method (blower-door method). The blower-door method is compared with the standard decay and rebound method for an idealized room (a portable building test cell; 6.08 m x 2.40 m x 2.60 m) under eight testing scenarios (empty, cardboard boxes in three arrangements, terry cloth wall covering, and three sets of window holes); run three times to establish the coefficient of variation representing precision. Results show that higher induced indoor-outdoor pressure differences cause a larger variation of estimated effective deposition rate on different indoor surfaces. The deposition rate and penetration factor may be influenced by indoor surface materials. The blower-door method gives higher precision for the estimates, and detects subtle differences in penetration factors, which may be difficult using the decay and rebound method. © The Author(s) 2020.

Research Area(s)

  • Air change rates, Furnishings, Indoor characteristics, Air tightness, Pressure differences, PARTICLE PENETRATION, FINE PARTICLES, AIR-POLLUTION, INDOOR, INFILTRATION, VENTILATION, OUTDOOR, RESIDENCES, SMOOTH, SIZE