UV-C PATHOGEN REFERENCE
Pick a pathogen, choose where UV-C is applied, and enter your system details. We’ll compare delivered vs. required dose for your target log reduction.
Pathogen
Application
Target Reduction
In-Duct Inputs
Lamp Set (optional)
Coil Inputs
Results
ASHRAE Conformance
185.2 method reference
Reference methods: ASHRAE Standard 185.2 (in-duct UV-C device test) and the UV-C section of the ASHRAE HVAC Applications Handbook. View ASHRAE standards
Required Dose: —
Delivered Dose: —
Exposure Time: —
Required Avg Irradiance: —
—
Pass if delivered ≥ required. In-duct mode uses CFM × duct area × length for residence time; dose = irradiance × time.
Show math & citation
Awaiting calculation…
Notes: Lamp size can auto-fill default watts (editable). “Not vetted” organisms are selectable for search but won’t run calculations.
PATHEGON MITIGATION EXPLAINED
In-Duct (Air) — What it does & how we size it
Plain English: We slow the air down inside a UV-lit section of duct long enough to give germs a knockout dose of UV-C.
How we size: Dose = Irradiance × Time
Time comes from your CFM, duct area (W×H), and UV length (L): higher CFM or smaller duct = faster air = less time, so we adjust irradiance or length to hit the target.
Your output: PASS/FAIL vs. the dose needed for your chosen log-reduction (99%, 99.9%, etc.) for a vetted organism.
At the Coil (Surface) — What it does & how we set it
Plain English: We keep coils clean by bathing the coil face in continuous UV-C, stopping biofilm before it starts.
Two simple ways to set it:
Threshold method: Hold ~100–150 µW/cm² at the coil face (maintenance vs. aggressive).
Dose method: Ensure the coil receives a set mJ/cm² dose over a known window (e.g., 1 hour).
Either way, the tool compares measured coil irradiance or accumulated dose to your chosen target and shows PASS/FAIL.
WHAT ASHRAE HAS TO SAY
ASHRAE — Where this approach comes from (simplified)
In-duct UVGI: We follow the same fundamentals and test logic described in ASHRAE Standard 185.2 (how devices are evaluated in ducts) and the ASHRAE HVAC Applications Handbook UV-C sections (layout, measurement, maintenance).
Coil irradiation: The Handbook describes using minimum coil-face irradiance or surface dose over time to suppress growth and maintain heat-transfer performance.
Engineer takeaway: Our calculator mirrors that structure: it computes residence time in the UV zone for air, and irradiance/dose at the coil for surfaces, then checks against a required dose for the desired log-reduction or maintenance target.
