An HVAC UV light for coil disinfection should be installed just downstream of the evaporator coil, inside the supply plenum, aimed directly at the coil face and drain pan for constant line‑of‑sight exposure. This spot targets the damp surfaces where mold and biofilm tend to grow most. We typically see the best results when the lamp floods the wettest corner of the pan rather than only grazing the coil fins. Our team installs and services coil‑ and duct‑mounted UV units across the Rockville area, and we select the mounting location that optimizes purification and service access.
For best results, a technician will usually:
- Aim the lamp to cover the entire coil face and drain pan without obstructions.
- Place it close enough for strong exposure while keeping safe service clearance.
- Shield or reroute UV‑sensitive plastics and wiring, and seal panels to prevent light leaks.
- Include a clean sight port and plan for annual lamp replacement.
Do not power a UV‑C lamp with panels open or look at it directly, as exposure can harm eyes and skin.
Updated: 2026-09-29
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