DuctPro Engineering(H.K.) Ltd.

The American Society of Heating, Refrigerating and Air-conditioning Engineers (ASHRAE) (http://www.ashrae.org/)	World Health Organization (WHO) (http://www.who.int/)
The United States Environmental Protection Agency (USEPA) (http://www.epa.gov/)	Indoor Air Quality Information Centre (http://www.iaq.gov.hk)
National Air Duct Cleaning Association (NADCA) (http://www.nadca.com)	Hong Kong Environmental Protection Department (HKEPD) (http://www.epd.gov.hk/epd/)
Heating and Ventilating Contractors Association (HVCA) (www.hvca.org.uk)	National Institute of Occupational Safety and Health (NIOSH) (http://www.cdc.gov/niosh/)
The American Conference of Governmental Industrial Hygienists, Inc. (ACGIH) (http://www.acgih.org/)	American Indoor Air Quality Council (http://iaqcouncil.org/)

HKSAR Government- Electrical and Mechanical Service Department Approved Contractor