New Jersey Air Duct Pros guide
After a Flood: What New Jersey Homeowners Should Know About Ductwork
If floodwater reached your furnace, air handler, or ductwork, don't restart the system until a qualified professional has evaluated it; New Jersey's Department of Labor and Workforce Development warned after Superstorm Sandy that operating flood-damaged HVAC equipment can cause fires and injuries. EPA says wet or moldy duct insulation can't be effectively cleaned and should be replaced. Routine duct cleaning can help remove remaining dust and debris only after the system has been evaluated and repaired; it is not flood restoration, disinfection, or mold remediation.
Updated October 19, 2026Sources listed below
Why this matters in New Jersey
NOAA's New Jersey climate summary lists coastal nor'easters, flooding rains, tropical storms, and, on rare occasions, hurricanes among the extreme weather the state typically experiences, and describes Superstorm Sandy in 2012 as the most extreme and destructive recent event, with an estimated $29.4 billion in repair, response, and restoration costs. NOAA also projects increases in winter and spring precipitation and in extreme precipitation events.
When water reaches a basement or crawlspace, it can reach the furnace, air handler, and ductwork located there.
Don't restart flooded equipment
In a November 2012 safety alert, New Jersey's Department of Labor and Workforce Development warned that trying to turn on or operate HVAC equipment after a flood can cause a fire, property damage, serious injury, or death because of malfunctioning controls, and said a professional should evaluate flood-damaged equipment thoroughly. From a safety standpoint, it recommended replacement over repair for flood-damaged boilers and related equipment.
The New Jersey Department of Health likewise advises that a ventilation system be inspected before it is used after flooding.
Sources: N.J. Department of Labor and Workforce Development: safety alert on flood-damaged boilers and HVAC equipment (Nov. 2, 2012); New Jersey Department of Health: After a flood, Cleaning/Mold removal
Wet duct insulation usually has to go
EPA's duct cleaning guidance says that if insulated air ducts get wet or moldy, the insulation cannot be effectively cleaned and should be removed and replaced. EPA also notes that controlling moisture is the most effective way to prevent biological growth in air ducts.
For ductwork that stays in service, New Jersey's Department of Health says cleaning may be necessary to remove debris left by flooding and that professional help may be needed.
Sources: U.S. EPA: Should You Have the Air Ducts in Your Home Cleaned?; New Jersey Department of Health: After a flood, Cleaning/Mold removal
Where cleaning fits, and where it doesn't
Once an HVAC professional has evaluated the system and any water-damaged components or insulation have been replaced, cleaning can remove remaining dust and debris from the ducts that stay in service.
Duct cleaning does not include flood restoration, drying, disinfection, or mold remediation. New Jersey's Department of Health notes that disinfection may be necessary after flooding but cautions that not all disinfectants are appropriate for ventilation systems, and EPA reports that no products are currently registered as biocides for fiberglass duct board or fiberglass-lined ducts.
Sources: New Jersey Department of Health: After a flood, Cleaning/Mold removal; U.S. EPA: Should You Have the Air Ducts in Your Home Cleaned?
A short checklist
If water reached your heating and cooling system:
- Leave the system off until a qualified HVAC professional has evaluated it.
- Ask whether any insulated ducts, duct board, or lined ducts got wet; EPA says those should be replaced.
- Contact your insurer about flood-damaged equipment.
- Once repairs are done, consider whether the remaining ducts need cleaning to remove leftover debris.
Sources: N.J. Department of Labor and Workforce Development: safety alert on flood-damaged boilers and HVAC equipment (Nov. 2, 2012); U.S. EPA: Should You Have the Air Ducts in Your Home Cleaned?