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HVAC & Air Distribution Mold Inspection Case Studies

Inspection cases focused on conditions near heating, ventilation, and air-distribution components.

3 published casesHVAC & Air Distribution Water Damage Bathrooms
Surface growth on an uninsulated AC condensate drain line in a Dallas attic

Mold on an AC Condensate Drain Line in a Dallas Attic

A Dallas homeowner requested an independent assessment after an HVAC technician noticed suspected growth on attic condensate piping. A surface swab supported fungal growth on the pipe exterior; no visible mold growth was observed inside accessible portions of the air handler or connected ductwork.

Dallas, Texas · Single-family residential · HVAC & Air Distribution

  • ac condensate line
  • hvac
  • attic
  • cladosporium
  • surface sampling
  • condensation
  • air handler
  • pvc drain line
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White and gray surface colonization on the accessible interior HVAC supply-plenum liner

Mold Found Inside an HVAC Supply Plenum in a Dallas Home

A Dallas homeowner requested an independent assessment after an HVAC professional reported suspected growth inside an attic supply plenum. Accessible fiberglass duct-board liner showed extensive surface colonization. Surface swabs supported fungal growth inside the plenum and on a downstream living-room supply grill. No air samples were collected.

Dallas, Texas · Single-family residential · HVAC & Air Distribution

  • hvac
  • supply plenum
  • duct board
  • air vent
  • supply grill
  • cladosporium
  • aspergillus penicillium like spores
  • surface sampling
  • attic
  • air handler
  • mold in hvac
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Visible dark growth on the face and louvers of the sampled left playroom HVAC supply grill

Mold Found Inside One HVAC Duct Branch in a Dallas Home

A Dallas homeowner requested an independent assessment after an HVAC contractor saw material inside supply ductwork that might have been microbial growth or dirt. Two playroom supply grills and accessible interior surfaces behind them showed visible growth. Both grills shared one duct branch with damaged jacket and insulation; the accessible air handler and other inspected runs showed no comparable growth. A swab from the left playroom grill returned Heavy Cladosporium, while the playroom air sample did not show amplification relative to an outdoor comparison at the sampled time.

Dallas, Texas · Single-family residential · HVAC & Air Distribution

  • hvac
  • ductwork
  • flex duct
  • supply vent
  • supply grill
  • cladosporium
  • borescope
  • attic
  • duct leakage
  • air sampling
  • damaged duct
  • mold in air ducts
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