Experience Unmatched Airflow and Cool Whisper-Quiet Operation.
At a Glance: Q-Max™ Pro Series Fans offer a cool and quiet fan solution, seamlessly integrating the renowned Max-Fan™ and Max-Fan™ Pro Series motors with an acoustic foam liner inside a muffler for superior sound absorption. This integrated design not only cools both the fan's intake and exhaust but also encapsulates the motor, ensuring unrivaled airflow with a cool touch and whisper-quiet operation. Q-Max™ fans come with built-in hang tabs for added isolation and easy installation, and some models feature a built-in 3-speed selector.
Details:
ETL Commercial/Industrial-rated
Manufactured in Germany
Built-in 3-speed controller
Fan enclosed in a muffler with acoustic foam insulation
Cools both intake and exhaust, combining the functions of 2 mufflers in a compact space
Built-in hang tabs for vibration isolation
Optimized mixed flow for exceptional energy efficiency
Lower operational cost compared to traditional centrifugal fans
5-year warranty
Available in sizes 6″ – 12″
if you have read til here....yes they are expensive but by far the best in the market.