Axial duct inlet-and-exhaust fan with fastening set BB D100

The PRO 4 is a 100 mm axial duct fan built for continuous or timed extraction in bathrooms, toilets, and kitchens, or for balanced fresh-air supply when mounted in the opposite direction. A durable ABS housing and impeller keep it lightweight and resistant to humidity and UV, while the ball-bearing motor is rated for up to 40,000 hours of continuous operation - well beyond the sleeve-bearing motors used in cheaper fans.

Key features

• Ball-bearing motor
  Rated for up to 40,000 running hours, backed by a 5-year warranty.
• Overheat protection
  A built-in thermal fuse shuts the motor down before it can overheat during long runs.
• Quiet, efficient airflow
  Moves 115 m³/h at only 32 dB(A) and 14 W, so it can run continuously without driving up the electricity bill.
• Dual-direction mounting
  Install it as an exhaust fan or, reversed, as a supply fan, depending on where it sits in the ventilation system.
• Fast duct installation
  Ships with a matching fastening/mounting kit for a standard 100 mm duct spigot, no extra adapters needed.

Technical specifications

Frequently asked questions

Will it fit my existing 100 mm duct?
Yes - PRO 4 is sized for standard 100 mm ducting and ships with a fastening kit for a direct, end-to-end connection.

Is it safe to run continuously in a bathroom?
Yes. The ball-bearing motor and thermal overheat protection are designed for continuous or long timer-cycle operation in humid rooms.

A compact, reliable choice for anyone replacing an old, noisy bathroom or kitchen fan without changing the existing ducting.