Rounded Corners

Tunnel Ventilation

The majority of tunnel ventilation projects fall under two categories: subways and automobile tunnels. Both types of projects require very powerful fans, moving large volumes of air to prevent the buildup of unwanted gases and fumes. In all tunnel projects, environmental noise is a major concern. 

Environmental Noise

Problem Solution

Environmental Noise

Noise from the fans as well as subway cars and automobiles.

Sound levels at the property line are required to be 45 to 60 dBA, depending on the local municipal bylaw. Noise above this level often results in complaints from neighboring offices or residents.

Inlet and discharge silencers designed specifically for the project requirements.

Since these projects are usually very high profile, testing is important. Mock testing is an effective way of ensuring the silencer solutions will work.

Spaces / Access

Problem Solution

Spaces / Access

The noise control solution is typically large, making access for installation a challenge.

Silencers with modular construction – Silencers to be designed and shipped with shipping splits as per site requirements.

Project: Autoroute Tunnel Ville Marie

Pressure drop and high pressure on silencers

Problem Solution

Pressure drop and high pressure on silencers

Since a major function of the fans is life safety, ensuring minimal pressure drop is imperative.

The fans used in tunnel systems create a very high static which places a great deal of pressure on the silencing solution and can damage the silencer.

Flow shaping silencers. The type, shape and size of the silencer do not only depend on the required insertion loss. Silencers with flow shaping internals help minimize pressure drop and provide uniform air distribution for fan intake and discharge.

EX casing silencers are designed with the acoustic media out of the airstream, allowing noise reduction at limited to no added pressure drop (compared to ductwork).

Silencers to be constructed out of heavy gauge material and be continuously welded or include Pittsburg lock if needed.

Exposure to heat, fumes, dirt, and the environment

Problem Solution

Exposure to heat, fumes, dirt, and the environment

Exposure to heat, fumes, dirt, and the environment.

Silencer to be constructed out of special materials to withstand exposure. Material selection should be based on the exposure on a project specific bases.