Can Occupants Safely Exit a Building Through an Elevator Roof Hatch?

Imagine a world without elevators. What a nightmare. These mechanical marvels offer exceptional convenience and utility. Since they're prevalent, many people take them for granted. It is incredible how unfamiliar we are with a mechanism that we encounter and rely on so frequently.

It's okay if your only familiarity with elevators outside your daily life comes from movies. However, these representations usually need to be more accurate.

A prime example is the movie Live Fast or Die Hard, which sees the main character, John McClane, narrowly escape a foe by hanging on to a cable suspended in an elevator shaft. Brushing aside the inconsistencies that landed him there in the first place, the only remotely factual aspect is that there are pulley systems located in some elevator shafts.

But are you aware of what an elevator shaft is? Or a pulley system? Does a hydraulic or traction elevator move faster? Is an elevator roof hatch located above an elevator, and if so, can it be used to escape in an emergency? By the end of this article, you will understand the elevators you encounter daily for general awareness so that you can remain as cool, calm, and collected as McClane in an emergency.

What Types of Elevators Are in Modern Buildings?

Within most modern multi-story buildings, you will find an elevator shaft that extends from the foundation to the roof. The shaft, or hoistway, is an enclosed space that accommodates elevator components for lift and descent. Here, you will find the elevator car, safety devices, landing, car doors, lighting, and ventilation systems.

Hydraulic Elevators

What differentiates elevator types is the lift-and-lower systems contained within the elevator shaft. The less common hydraulic elevator works precisely as the name suggests, relying on hydraulic power from a non-flammable liquid-filled cylinder below the elevator car or platform.

With the press of a button, the system's electric motor engages, pressurizing the fluid and forcing it to cycle to the bottom of the cylinder. As the fluid cycles, the pistons within the cylinder are set in motion, resulting in a platform lift. The mechanism works the same for the descent, with the difference being that the pistons pump in the opposite direction.

Due to the pressure component, hydraulic elevators rise slowly, requiring more energy to generate lift because the pistons need more time to build up sufficient kinetic energy. Hydraulic elevators are typically installed in low- to mid-rise buildings due to energy demands. However, they are cheaper to install and require less maintenance.

The area service technicians require the most access to is below the elevator car. Because of this, machine rooms are located near the base floor, and within them you will find the elevator's hydraulic pump unit, noise-isolation systems, and electrical and safety components. These rooms are restricted to the public, with only access granted to maintenance personnel, including licensed electricians.

Traction Elevators

Traction elevators use elevator shafts to suspend cables attached to the elevator car, creating a pulley system with a traction machine overhead. With guide rails fixed along the elevator shaft, sliding guide shoes affixed to the outside of the elevator car allow easy vertical movement along the shaft.

After pressing the desired floor button, the system would direct energy to the traction machine, which engages the mechanism's pulley system, causing its gears to spin. A counterweight on the opposite side of the elevator car within the shaft reduces the energy required to lift the car, guided by sliding shoes that move along the tracks. This mechanism allows easier, faster movement between floors with less energy required. These elevators are far more efficient and, thus, faster for more controlled lifts and descents. However, they are more expensive to install and require frequent maintenance and diligent inspections from certified professionals.

Because traction elevators utilize a pulley system for lifts and descents, their machine rooms are usually near the roof of the building on the penthouse floor. They can be located directly above the elevator shaft or adjacent to it. The placement of the room depends on several factors, including building codes and noise requirements, its proximity to multi-family dwellings and office spaces, and the size of the building floor.

The rooms house a traction machine, a controller, a motor and drive unit, a power supply, and other mechanical components. With many moving parts at the highest point of a building, this area is particularly vulnerable. Not only is the room permanently restricted to qualified personnel to prevent unauthorized access and tampering, but it is also heavily ventilated to prevent these components from overheating. Fire safety is paramount; you should consider safety features seriously.

Elevator and Elevator Shaft Safety

Although ventilation systems are usually reliable, occupant safety requires construction professionals to account for all possibilities. Depending on building code requirements, the elevator shaft may or may not contain sprinkler systems to contain fires in emergencies. Thus, equipment is incorporated to mitigate potential disasters, offering far more convenience and practicality.

For this reason, roof hatches, known as elevator shaft smoke vents, provide great versatility and utility because they are installed directly over hydraulic and traction elevator shafts. Alternatively, they can be applied over or in the vicinity of the machine room on the roof of the building.

Smoke vents such as our BA-NB-20SV Single-leaf Automatic Smoke Vent are ideal for applications on your building's roofs or in elevator shafts. Because shafts are enclosed spaces, they serve as natural funnels and exit points for smoke and noxious gases in the event of a fire, provided proper ventilation is in place. BA-NB-20SV boasts enhanced safety features, such as fire and smoke alarm detection, and an expanded area for maximum ventilation to aerate spaces.

With a UL-listed fusible link, BA-NB-20SV boasts an automatic panel release mechanism that activates at temperatures over 174 degrees Fahrenheit (74 degrees Celsius). These ultra-reliable doors will withstand a force of up to 49 km per square meter and automatically lock in the open position for maximum ventilation.

These ventilation systems are critical to the health and safety of elevator shafts, as they can contain the structural impact of fires while localizing them, ensuring a safe and timely evacuation by building occupants. In the event of a blaze, smoke vents localize fires by indicating to firefighters where they are occurring in a building, allowing more efficient extinguishing.

Can Occupants Use an Elevator Roof Hatch to Safely Exit a Building?

Simply put, no, you cannot. Above the elevator car is its emergency escape hatch, which remains bolted shut and is accessible only from the outside. However, the hatch is a precautionary measure for emergency crews to access occupants in case of a power outage or an emergency that prevents the elevator doors from opening.

Even if you could open an elevator roof hatch from the inside, it would lead to more shaft access, as you would remain within the elevator shaft with nothing but a roof and a machine room above.

Dealing With Emergencies

Evacuation plans emphasize the importance of exiting a building as quickly and efficiently as possible. If possible, always attempt to escape an emergency by following your building's emergency exit plans.

If trapped in an elevator cab, remain calm and locate the emergency response button rather than the elevator's escape hatch. Elevator services usually have 24-hour distress response phone lines. Communicate your position to the agent as clearly and efficiently as possible.

If it is a fire-related emergency, rely on elevator shaft ventilation systems, such as our BA-NB-SV20 Single-leaf Automatic Smoke Vent, and on overhead sprinkler systems to mitigate the blaze's impact and remain inside the elevator car. Communicate your location and wait for emergency personnel to take over.

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