AC Infinity Inline Duct Fan Silencer, 6-Inch Liquid & Weight Measuring Aerorock is a much better

Aerorock is a much better alternative to perlite

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AC Infinity Inline Duct Fan Silencer, 6-Inch Liquid & Weight Measuring Aerorock is a much betterDescription Duct Muffler: Designed for inline fans in grow rooms, bathroom fans, and other HVAC applications, this duct muffler features dual aluminum flanges that absorb sound waves from fan vibrations and airflow. It's a high quality tool for noise dampening in ventilation systems. High Quality Neoprene Foam: The muffler contains high grade neoprene foam arranged in an egg crate pattern capable of reducing fan noise by up to 50%. It's ideal for