Mason spring, neoprene and combination hangers
Over fifty years ago, vibration control hangers were in their infancy and it was not uncommon to use isolation materials such as a block of cork with a hole drilled through the center, two or three layers of rubber and cork pads or felt within the hanger frame.
These products all gave way to the lower frequency bonded steel strip rubber-in-shear elements and then to round rubber-in-shear designs which were lower in cost and higher in capacity. The next step was equivalent deflection in compression.

Ví dụ về cách tính toán tiêu âm cho quạt Model AP0804CA9/21

Elta Fans has a wealth of experience and knowledge, dedicated to understanding your particular needs. Whether your criteria is optimising space, specific performance characteristics, low noise level or a high specification finish, the JetVent range continues to enhance Elta’s reputation in the design and supply of specialist ventilation products.

The Fantech JetStream Systems feature a duct mounted centrifugal in-line fan that has been developed to optimise airflow while generating minimal noise. The slim-line design enables use where space is limited such as apartments, hotels and homes