Fullum mechanical ventilation station

Construction of the Fullum mechanical ventilation station

Project summary

As part of our program to refurbish métro infrastructure, we are building the Fullum mechanical ventilation station in Olivier-Robert Park.

There is already a station on that part of the Green line, but it was built during the second half of the 1960s. It has now reached the end of its service life and must be replaced. Our project involves building a new, quieter and more efficient ventilation station that meets the new safety standards and complies with City of Montréal noise bylaws. 

Duration of the work: September 28, 2018, to spring 2021

Description of the work: Construction of a new mechanical ventilation station

Impact on métro service: No

Impact on bus service: No

Impact on customer trips

The project has no impact on customer trips.

Impact on local residents


We use micro-blasting to break into the rock and perform the excavation work required for the project. The micro-blasting started in the week of April 29, 2019. We expect to have finished this important step in the construction of the mechanical ventilation station around mid November. We excavated at a depth of 30 metres below ground, which will allow us to reach the métro network.

Upcoming work

Once the micro-blasting is complete, we will finish excavating the tunnel using mechanical equipment, and the rock will be removed using a power shovel and a crane. We expect this phase to continue until the end of January 2020.

At the same time, we will begin the concrete work for the station’s infrastructure. Concrete mixers will therefore circulate around the site until early 2021. However, as planned, the work will be paused during the summer for eight weeks.

What measures are implemented to ensure safety around the worksite?

  • The construction site has already been fenced off, and the micro-blasting is done within its perimeter.
  • Blasting mats are installed over the rock to contain the micro-blasts.
  • Safety instructions are posted around the site.
  • No explosives are stored on site.
  • A professional firm specialized in monitoring vibrations has been mandated to ensure compliance with the standards established by the City of Montréal and the STM.
  • Carbon monoxide detectors have been installed in buildings within 100 metres from the site.

What is the usual procedure for warning nearby residents that a blast is imminent?

  1. 12 whistle or siren sounds
  2. 30-second wait
  3. Micro-blast
  4. One long whistle or siren sound
  5. End of blasting


We are planning on performing about three micro-blasts every six days. In general, the schedule will be as follows:

  • Day 1: one micro-blast at the end of the day
  • Day 2: one micro-blast in the morning and another at the end of the day
  • Day 3 to day 6: no micro-blasting

Will residents feel vibrations and hear noise?

Close to the worksite, residents may feel vibrations or hear noise when the micro-blast goes off, which is totally normal.

Why can’t the excavation work be performed with machinery?

The hardness and nature of the rock determines whether micro-blasting is needed or not. When the rock is really hard, compact and large in size, it is very difficult to break it up using a method other than micro-blasting. Given its efficiency, this method will reduce the duration of the work.

  • One parking lane is removed on both De Maisonneuve and Fullum.
  • Flag persons are present when trucks enter or exit the worksite on both De Maisonneuve and Fullum.
  • The 34 Sainte-Catherine bus stop was removed. The closest bus stop is at the corner of Dufresne.
  • The bicycle path on Fullum remains open.
  • Any construction work likely to generate noise will be scheduled between 7 a.m. and 7 p.m. on weekdays. In accordance with municipal regulations, some work may at times have to continue over the weekend to keep the project on schedule .
  • Excavation work will produce vibrations that may be felt by residents living next to the worksite. We have hired an independent consulting firm to survey all buildings (photographs) around the worksite. The inspections will serve to document the condition of buildings before and after construction. In the unlikely event that any damage is reported, an expert opinion could help determine whether the damage is the result of the vibrations produced by the project. Property owners concerned by the inspections will be notified accordingly .
  • A traffic and signage plan was prepared by a specialized firm and coordinated with the Ville-Marie borough and the City of Montréal. The plan will minimize the impact of the project on vehicle, cyclist, pedestrian and emergency services movements.

No major work in the summer of 2019 and 2020

Major work will be suspended for eight weeks during the summer so that citizens can enjoy the park. The fences surrounding the work site, however, will remain in place for obvious safety reasons.

Safe access to Olivier-Robert Park

Olivier-Robert Park is accessible via the entrance at the corner of Fullum and Olivier-Robert. A four-way stop was installed at this intersection to ensure safe access to the park. Crossing the Fullum and De Maisonneuve intersection is possible only from the west side of the street.

Local resident?

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Learn more about the project

A mechanical ventilation station is a large infrastructure located between two métro stations that is equipped with two powerful fans designed to extract hot air from the métro system through inlets fitted with air vents. Ventilation stations built for the original métro system extract around 60,000 cubic feet of air per minute, while the new ventilation systems extract around 240,000 cubic feet per minute. Huge noise suppressors mitigate the noise from these fans to ensure quiet for residents living close to a ventilation station.

  1. Preparation of worksite
    Fencing off the worksite
    Setting up the worksite and installing equipment
  2. Excavation at ground level
  3. Excavation in the rock bed
    Micro-blasting will be required to break into the rock bed. In this case, it is the fastest, most efficient way to proceed. Another option would have been jackhammering. However, given the volume of rock to be excavated, jackhammering would be less efficient, would take significantly more time, and be much more disruptive as the noise is constant.
  4. Installation of a membrane to ensure water-tightness of all infrastructures
  5. Concrete work for ventilation station
    Concrete work for all infrastructures
  6. Installation of mechanical and electrical equipment, as well as architectural finishes and exterior design
    Delivery of equipment to work site
    Installation of equipment
    Performance testing on mechanical equipment
    Construction of ventilation station’s external structure

For more information on mechanical ventilation stations, visit the page in the Major Projects section.

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This work is made possible through funding from the Ministère des Transports du Québec.

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