See What's
Hidden
Inside.
The VD-FID is the world's first and only ductoscope combining white-light HD, UV 365/405 nm fluorescence, and thermal/IR imaging in a single probe — delivering court-admissible forensic evidence in one inspection pass.
Choose Your Inspection Level
Two purpose-built ductoscopes — one for standard structural surveys, one for forensic-grade multi-spectrum investigation.
Basic Inspection Ductoscope
White LED illumination for structural inspection, debris detection, and routine HVAC documentation. Based on the VS-C23 platform with probe diameters from 0.85 to 8 mm and reach up to 30 m.
- HD white-light imaging
- 0.85–8 mm probe diameter
- 0.5–30 m probe length
- Structural & debris detection
- NADCA-compliant documentation
Forensic Inspection Ductoscope
The only ductoscope with 3 imaging modes in one probe
SpectraSwitch™ is the world's first and only triple-mode ductoscope system: white-light HD + UV 365/405 nm biofilm fluorescence + thermal/IR water leak mapping — all switchable in the field without removing the probe.
- SpectraSwitch™ 3-mode imaging
- UV 365 nm + 405 nm fluorescence
- Thermal/IR water leak detection
- Thermal mapping capability
- Court-admissible documentation
Three Modes.
One Probe.
Total Evidence.
The VD-FID's SpectraSwitch™ system switches between illumination modes in the field — no probe swap, no workflow interruption. Document structural conditions, reveal hidden biofilm under UV, and map thermal anomalies in a single inspection pass.
No other ductoscope offers this.
The VD-FID is the only instrument on the market combining all three imaging modes in a single field-deployable probe.
Built for Every Inspection Context
Commercial HVAC
Routine and forensic inspection of commercial duct systems for IAQ compliance and litigation support.
Healthcare Facilities
Mold and biofilm detection in hospital HVAC systems where contamination poses critical infection risks.
Industrial Plants
Structural inspection of industrial ductwork for debris, corrosion, and mechanical damage documentation.
Residential IAQ
Evidence-grade documentation for insurance claims, mold disputes, and post-remediation verification.
Forensic Investigation
Court-admissible documentation of contamination sources for legal proceedings and insurance claims.
Building Forensics
Integration with broader building forensic investigations including fire, flood, and sewage events.
Trusted by Forensic Professionals
From hospital infection control to litigation support — inspection professionals rely on DuctInspect instruments for evidence-grade results.
"The VD-FID's UV fluorescence capability revealed biofilm colonies in a hospital HVAC system that were completely invisible under white light. That single inspection prevented a potential outbreak and saved our client from significant liability exposure."
"We've been using the VD-BI for NADCA-compliant documentation on commercial projects for two years. The 30-metre probe reach and on-device recording have completely eliminated the need for multiple access panel cuts — our inspection time is down 40%."
"The SpectraSwitch™ technology is a game-changer for litigation support work. Being able to switch between white light, UV, and thermal in a single pass — with timestamped video evidence — has made our reports substantially more defensible in court."
"After a mold remediation project, we needed post-remediation verification that would satisfy our accreditation body. The VD-FID's UV documentation gave us exactly the evidence chain we needed. Accreditation passed without issue."
Hospital HVAC Biofilm Investigation
A 450-bed hospital reported recurring respiratory complaints among staff in the east wing. VD-FID UV inspection revealed extensive biofilm colonisation in supply ductwork invisible to standard white-light inspection.
Contamination source identified, remediation scoped, and post-remediation verification completed — all in a single site visit.
Insurance Claim — Water Intrusion Mapping
Following a roof leak event, an insurer required evidence of water intrusion extent inside HVAC ductwork before approving a remediation claim. Thermal IR mapping documented moisture distribution across 180 m of ductwork.
Thermal evidence accepted by insurer. Claim approved within 72 hours of inspection report submission.
What is Forensic Duct Inspection?
Forensic air duct inspection is a specialized, evidence-driven examination of HVAC ductwork to determine the presence, source, and extent of contamination or defects — typically in the context of health complaints, building failures, insurance claims, or litigation.
Unlike routine cleaning checks, forensic inspection generates defensible documentation that can stand up in regulatory, legal, or remediation decision-making. It combines visual borescope inspection, UV fluorescence, thermal mapping, and environmental sampling to build a complete evidence record.
Read the complete forensic inspection guideReady to Inspect with Confidence?
Contact our team to discuss which ductoscope is right for your inspection workflow, or request a live product demonstration.