Dust is often part and parcel of construction work, which is why it’s essential to implement effective dust control methods to keep everyone on and around your site safe. Fog lances and dust suppression cannons are often used to suppress dust on site.

Here’s an overview of how these two dust suppression methods compare, along with a few tips on how and when to use them.

Fog lance vs dust cannon: what’s the difference?

While fog lances and dust cannons are both designed to control dust on site, there are a few key differences that set these two machines apart.

Fog lance

A fog lance is fitted with a specially designed nozzle that sprays a fine mist. The droplets created by this nozzle bind with airborne dust particles to push them to the ground. Fog lances are typically used in targeted applications where precision is needed, such as in enclosed spaces, tunnels or specific spots where dust is concentrated. 

These machines are often more water efficient than other dust suppression devices. By focusing the mist on a smaller area, a fog lance is able to minimise water usage while effectively settling dust in confined spaces. At Control Hire, our fog lance has a throwing distance of up to 20m.

Dust suppression cannon

Alternatively, a dust suppression cannon projects a powerful spray of water into the air over a wide area. These devices can be adjusted to cover various distances and angles, and often incorporate a fan to disperse the mist over a broader range. Dust cannons are capable of covering extensive areas, making them suitable for large construction sites, stockpiles and demolition areas where dust control needs to be widespread. 

While dust cannons are able to cover a larger area, they typically use a larger volume of water. Our V12S Dust Suppression Cannon has two different run speeds that can cover a range of anywhere from 25–65m.

Ultimately, the choice between a fog lance and a dust suppression cannon depends on the specific needs of the site. A fog lance is ideal for precise, localised dust control in confined spaces, while a dust suppression cannon is better suited for managing dust over large, open areas. 

When to use dust suppression solutions

As a person conducting a business or undertaking (PCBU), you have an obligation to keep yourself, your workers and your workplace safe from hazardous dust. As part of your duty, it’s up to you to implement the right control measures to either eliminate or manage exposure to dust on-site.

When it comes to construction sites, there are certain workplace exposure standards that apply to dust generated from specific products. 

Here are some common scenarios when dust suppression solutions should be used on a construction site:

• During demolition activities: Demolition generates a significant amount of dust. Dust suppression should be applied continuously during these activities to minimise airborne particles.

• Earthmoving and excavation: When moving large amounts of soil, dust is easily disturbed and becomes airborne. Using dust suppression solutions during these operations is essential.

• Cutting, grinding and sanding: Construction tasks that involve cutting, grinding or sanding materials like concrete, stone or metal generate a lot of dust. Water sprays or misting systems can help suppress dust at the source.

• Road and surface stabilisation: Unpaved roads and surfaces on construction sites can generate dust when vehicles and machinery move over them. Regular use of dust suppressants can stabilise these surfaces.

• During dry, windy conditions: Dry and windy weather can also exacerbate dust issues. Enhanced dust suppression measures should be implemented during these types of conditions to prevent dust from spreading beyond the construction site.

When it comes to construction sites and other work environments, like mining and bulk material handling sites, dust suppression solutions are often required to comply with government regulations relating to air quality and occupational health and safety. With this in mind, it’s essential to ensure that the dust control measures implemented meet the relevant regulatory standards.

Tips for using dust suppression solutions

While fog lances and dust suppression cannons are both designed to control dust, these two pieces of equipment are used slightly differently. 

How to use a fog lance

When using a fog lance for dust suppression, start by pinpointing the areas where dust is being generated, like cutting, grinding or material handling points. You’ll want to position the fog lance close to the dust source to maximise effectiveness. Adjust the angle and height of the lance to ensure the mist covers the dust-generating area thoroughly. 

Most fog lances are fitted with an automatic swing feature and adjustable tilt that can be controlled remotely. Keep the fog lance moving to evenly distribute the mist over the entire area. Try to slightly overlap the misting area to ensure there are no gaps where dust can escape.

How to use a dust suppression cannon

Dust suppression cannons are ideal for controlling dust in a larger, open area. Start by locating the primary areas where dust is being generated, like demolition sites and unpaved roads. Place the dust cannon in a strategic location where it can cover the maximum area affected by dust, making sure it’s on stable ground. Adjust the angle and height of the dust cannon to ensure the mist effectively reaches and covers the dust-generating areas.

Set the spray pattern and range according to the specific requirements of the site. Most dust cannons have adjustable nozzles and settings for fine-tuning the mist output.

Control Hire are the experts in dust control. With a range of dust control solutions available to hire, including fog lances and dust suppression cannons, you can trust Control Hire for all of your on-site dust management needs. Explore the full range or get in touch with our expert team to talk about your next project.