AC Infinity Inline Pipe Fan Muffler 6" Noise Reduction Silencer Hydroponics Growth Tent Ventilation Systems : Amazon.co.uk: Garden
RSA 450/450/080 (F) for use together with of AXC axial fans. 450mm duct, 450mm, long with 80mm insulation. The silencer should be mounted directly before or after the fan | Industrial | Commercial
Silencer for hydroponics environment - Slims Place
Can Silencer
Industrial fan silencers | Efficient noise reduction | BarkerBille