Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/9071
Title: Achieving 'excellent' indoor air quality in commercial offices equipped with air-handling unit - Respirable suspended particulate
Authors: Lam, KS 
Chan, FS
Fung, WY
Lui, BSS
Lau, LWL
Keywords: Air-handling unit
Cleaning rate
Filters
Indoor air quality
Offices
Respirable suspended particulates
Issue Date: 2006
Publisher: Wiley-Blackwell
Source: Indoor air, 2006, v. 16, no. 2, p. 86-97 How to cite?
Journal: Indoor air 
Abstract: A study was carried out to investigate the feasibility of achieving ultra low respirable suspended particulates (RSP) in commercial offices without major modification of existing ventilation systems by enhancing the particulates removal efficiency of existing central ventilation systems. Four types of filters which include pre-filters, cartridge filters, bag filters and high efficiency particulates air (HEPA) filters were tested in a commercial building in Causeway Bay. The results show that an RSP objective of <20 μg/m 3 could be met by removing RSP from both the return air and outdoor air supply simultaneously. This level of performance is classed as 'excellent' by the Hong Kong Government, Environmental Protection Department. Filters with efficiency that exceed 80% placed both in the return air and outdoor air were sufficient to meet the objective. It is not necessary to install HEPA filters to achieve the 'excellent' class. The outdoor air filter has great influence on the steady state indoor RSP concentration while the effective cleaning rate is governed by the return air filter. Higher efficiency filters increased the static drop but the volume flow of the air fan was not affected significantly. The additional cost incurred was <5% of the existing operation cost.
URI: http://hdl.handle.net/10397/9071
ISSN: 0905-6947
EISSN: 1600-0668
DOI: 10.1111/j.1600-0668.2005.00409.x
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