Outdoor cabinets, EV chargers, marine electronics and food-service equipment all ask the same question: can the fan survive water and dust? The answer is an IP rating — but the number on the datasheet only means something if the sealing inside the fan is engineered correctly.
What the IP code actually says
An IP rating has two digits: the first for solids (dust), the second for water. The ones that matter for fans:
- IP20 — open frame; indoor, clean environments only
- IP54 — dust-protected; dust cannot interfere with operation, splashing water tolerated
- IP67 — fully dust-tight; survives immersion at 1 m for 30 minutes
- IP68 — continuous immersion per the manufacturer's specification; for washdown and outdoor-exposed equipment
How a fan is actually sealed
Water and dust have three ways into a fan: the motor chamber, the PCB, and the cable entry. A properly rated version closes all three:
- PCB protection: conformal coating for condensing environments, full epoxy potting for IP67/68 — the driver IC and windings transitions are buried in resin
- Bearing system: waterproof bearing assembly with labyrinth or lip seals, so grease cannot be washed out and water cannot wick in
- Cable entry: sealed gland or over-molded lead wire instead of an open connector header
- Housing: ultrasonically welded or gasketed frame halves; vent membranes equalize pressure without admitting water
The honest trade-offs
Sealing is not free, and any supplier who claims otherwise is selling you a label:
| Version | Airflow impact | Cost impact | Typical use |
|---|---|---|---|
| Standard IP20 | Baseline | Baseline | Indoor equipment |
| IP54 dust-proof | ≈ 0–3% | Low | Dusty factories, cabinets |
| IP67 / IP68 | ≈ 5–12% lower | Medium–high | Outdoor, washdown, marine |
Potting also slows heat rejection from the driver IC slightly, so our IP68 designs run derated — a waterproof fan specified at the same RPM as an open-frame one will run a little warmer internally. That margin is engineered in from the start, which is why it must be part of the original specification, not a last-minute swap.
How we validate it
Every waterproof design batch is verified in our test lab: dust chamber cycling for IP5X/6X, immersion tank tests for IP67/68, plus high–low temperature cycling to confirm the seals survive thermal expansion. Batch test reports accompany shipments on request.
Specify the lowest rating that genuinely survives your environment. IP68 on a fan that lives behind a gasketed panel is money and airflow wasted; IP54 on an outdoor pole-mounted charger is a warranty claim waiting to happen.
Need an IP-rated version?
Tell us the mounting environment — we will recommend the right rating and quote the sealed version within one working day.