Research Methodology TechSci Research used its own forecast tool, which is based on the growth of various allied industries in respective regions. TechSci Research also used the impact analysis during short, medium and long term period to estimate the demand and to reach accurate market numbers. It should be noted that the figures compiled are only for the organized market including market share data. The currency used in the report is the United States Dollar (USD), with the market size indicated in USD million. Partial List of Companies Interviewed Key Secondary Sources • Action Duct Cleaning Company, Inc. ▪ World Bank • Hughes Environmental ▪ TechSci Research Proprietary Database & Knowledge • ServiceMaster Repository • Clean Air Services ▪ Company Annual Reports • Green Cleaning SystemsInc. (Dustless Duct) ▪ Industry Magazines • Heinen& Hopman ▪ Industry Reports • Service-Tech Corporation ▪ News Dailies • Bluestar Limited ▪ Credible Paid Databases • ONE MDC RESOURCES (1MDC) • Maclean Services Sdn Bhd • Big Red Environmental • Air-Care Engineering (S) Pte Ltd 23