You might be blowing contaminants from sediments left from the excessive water. Clean or hose out the ducts first. If the water damage is extensive, you may want to call a contractor who specializes in water extraction. These pointers come from the National Safety Council's fact sheet on floods and indoor air quality. The National Safety Council's Air Quality Program manages a Speaker's Referral Service to assist health departments, community groups, governmental agencies, nonprofit organizations, and others to identify speakers.
Individuals listed are able to speak about indoor air quality and other environmental health issues.
The National Safety Council's Air Quality Program is collecting education and outreach materials from federal, state, local, and nonprofit air quality programs across the country. Materials will be compiled into a nationally distributed database intended to help identify existing education and outreach materials and to provide contacts and summaries so that new materials need not be re-invented. The Indoor Air Community Leader Kit was developed by the National Safety Council's Air Quality Program in cooperation with the US Environmental Protection Agency. The kit provides information needed to educate colleagues and community members about the health risks of indoor air pollution. Materials include pollutant fact sheets, presentation slides and script, suggested activities, sample letters, and a video provided by the American Lung Association.