This document is the 3M Overhead Air Ionizer 991 instruction manual, which introduces the product features, installation, operation, maintenance, etc.
The 3M Overhead Air Ionizer 991 is a ceiling‑mounted device that neutralizes static charge on non‑conductive objects in electronics manufacturing environments. It provides steady‑state DC ion emission, three fans with high/low speed control, and an auto‑clean brush system to keep emitter points clear.
The manual covers safety warnings, installation steps, power‑plug connection, daisy‑chaining of up to ten units, operation controls, fault indication, cleaning procedures, specifications, accessories, and service contacts. Follow the guidelines to ensure safe use, proper grounding, and reliable performance.
| Length | 44 inches (111.8 cm) |
|---|---|
| Air Flow | 114 CFM per fan (high speed) |
| Audible Noise | 6 dB high fan speed, 57 dB low fan speed |
| Input Current | 0.4 A max |
| Discharge Time | ≤ 8 seconds under each fan at 18 in. distance |
| Daisy‑Chain Capacity | 10 units maximum |
| Weight | 10 lb (4.5 kg) |
Up to ten units can be daisy‑chained, using #18 AWG (0.8 mm²) 3‑conductor cable between each unit.
A solution of 50 % deionized water and 50 % isopropanol (IPA) is recommended.