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Ventilation Hazard Icon VENTEX® Ventilation Fans

Are you looking to rent industrial or construction site fans? or LEV systems? RVT are specialists in ventilation solutions and offer a wide range of heavy duty fans, including axial fans, centrifugal fans and mixed-flow fans. We even offer ATEX fans for use in explosive atmospheres. Whether you need high pressure ventilation or high volume airflow, RVT can offer a best practice ventilation solution. Positive pressure systems can be used to force fresh air deep into enclosed spaces, alternatively negative pressure systems can be used to extract contaminated air out of a work area. With airflows of up to 120,000m3/h, our fans are ideal for basement ventilation, tunnel ventilation, shaft ventilation, warehouses, industrial applications and more.

Need a Quote for a Temporary Ventilation System?

Whether you require ventilation for a tunnel, basement, shaft or another environment, our consultants will be pleased to calculate the airflows required and talk you through the best ventilation options for your site.

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Ventilation FAQ's

Learn More About Ventilation

What is the difference between an axial and a centrifugal fan?

An Axial fan has its motor located in the middle of the fan casing, and the airflow passes around it. A centrifugal fan has its motor located to the side of the fan casing, with a ‘snail’ shaped impeller. Typically a centrifugal fan will provide less airflow but at higher pressure than an axial fan with the same size motor.

Is an axial fan better than a centrifugal fan?

Axial fans are better for moving high volumes of air over short distances, whereas Centrifugal fans are better at maintaining high pressure over long duct runs. Despite a lower flow rate, centrifugal fans create a steadier flow, resulting in a significantly higher static efficiency. Centrifugal fans are also typically quieter than axial fans, and even with attenuators fitted are more compact. The best fan to use therefore depends on the requirements of the project.

What fans are best suited for tunnel ventilation?

For railway tunnels, centrifugal fans are often the preferred option as they can be situated outside the tunnel, ensuring that they do not get in the way or block access for vehicles and machinery. Centrifugal fans also maintain high pressure over long duct runs, so they can deliver clean air deep into long tunnels; however, we have also supplied large, high power axial fans, for several tunnel projects.

What fans are best suited for basement ventilation projects?

Typically, Centrifugal fans are the best fans to use for basement ventilation, because they are quiet, compact and perform well even when using long duct runs or duct runs with multiple bends (as is often required to be the case), however we have also used our largest high power Axial fans to force fresh air into many top-down construction basement projects.

Each basement project is unique; different activities, access points, depth and volume of excavation etc. and therefore requires a tailored approach.

How many air changes do we need when we hire an industrial fan?

In section 3 of the government guidance titled 'Transmission characteristics and principles of infection prevention and control', Public Health England explain that;

"A single air change is estimated to remove 63% of airborne contaminants, after 5 air changes less than 1% of airborne contamination is thought to remain".

The number of air changes required will depend on the environment you are working in and the activities you are conducting; the higher the airborne risk, the more air changes required.

In sensitive environments, Public Health England recommend 6 - 12 air changes per hour.

What is the best way to control airborne contaminants and maintain good air quality on site?

This is a very broad question and the answer depends on what type of environment you are working in, the size of the work space, the types of activities you are undertaking, and what contaminants you are dealing with (eg. dust, fumes, DEEEs, gases etc.).

However, generally speaking there are two ventilation methods for controlling airborne contaminants on site; supply and/ or extraction. Positive pressure ventilation systems can be used to supply a constant flow of clean air into a work space which will displace any contaminated air. Alternatively, if you have a specific activity that is generating the airborne contaminants, a local exhaust ventilation system (portable LEV) can be used to extract and filter the contaminated air out of the work space. Quite often, a combination of the two methods will work well; use an appropriate extraction system with capture hood to capture and extract the contaminants at the source of the activity, then force in clean air to dilute the residual contaminants in the air.

Learn more about best practice ventilation

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