The switch shop at the Muromsk Switch Factory employs a technology in which the the surface of a stock rail and a switch rail are heated by an HF current and exposed to a jet of compressed air. The noise generated by these operation exceeds health standards by 12-22 dB. Working with specialists from the Zhukov Central Aerohydrodynamic Institute, a sound suppressor that was compact, efficient, and easy to use was developed for the process. The suppressor is a rectangular, dual chamber device of the active type. The direction of the air jet is changed three times and is directed outward at the end of the operation. The double-layer walls of the suppressor are made of ultrathin basalt fibers with sound absorbing compartments welded over the inlet and outlet of the suppressor. The total noise reduction achieved with the suppressor in tests was 14-18 dBA. The noise reduction increased to 18-22 dBA for high frequencies.