What the 12 Inch S-Prime Moves at 1,692 CFM
Two sizes up from the 10 inch, the numbers stop being gentle. This 12 inch S-Prime moves 1,692 CFM and draws as much as 4.7A at 120V, with retailer listings putting the working figure around 469W. Maximum sound is 77 dB. It weighs 33.5 lbs, carries class F insulation and a TMI thermal switch, and is rated from -13°F to 104°F.
Where a Quiet 12 Inch Duct Fan Actually Helps
This is the size for a room or a shared exhaust trunk where noise matters as much as airflow. Two things are worth planning the install around. That current draw is a large share of a 15A circuit already carrying lights. And this is a two-person lift onto a hanger that must never rest on the ducting. Unlike the 10 inch it has a plain power switch rather than three speeds. An external controller is how you trim airflow day to day. Ruck builds it in Germany and covers it for three years.
Key Features
- 1,692 CFM: Mixed flow output for a 12 inch duct.
- Sound Insulated Casing: Galvanized steel lined to damp noise off the fan body.
- One-Phase AC Motor: Simple, serviceable, and mains-powered.
- Integrated Switch: Mounted on the casing, no extra wiring needed.
- Mixed Flow Impeller: Holds pressure where an axial booster would stall.
- Made in Germany: Built and tested at the Ruck factory.
- 3-Year Warranty: Covered for three years, German built.
Technical Specifications
| Specification | Value |
|---|---|
| Duct Size | 12 in |
| Airflow | 1,692 CFM |
| Max Current | 4.7 A |
| Speed Control | Integrated power switch |
| Noise (max) | 77 dB |
| Weight | 33.5 lbs |
| Operating Temperature | -13 to 104 °F |
| Motor Protection | TMI thermal switch |
| Insulation Class | F |
| Certification | UL and CSA |
| Voltage | 120V, 60 Hz |
| Motor | One-phase AC |
| Casing | Sound insulated galvanized sheet steel |
| Impeller | Mixed flow |
| Warranty | 3 years |
| Origin | Made in Germany |