Fans FAQs

Cooling Fans FAQS

What is the difference between an axial and centrifugal fan?

The axial fan design air flows parallel with the shaft that the fan blade is connected to. The casing is usually cylindrical in shape.
Centrifugal fan design air enters into the side of the snail-shaped casing and is directed off the fan blade to an outlet in the fan casing. Axial fans applications are normally used in high volume/low-pressure airflows are required. Centrifugal fans can produce quieter higher pressures as well as provide larger volumes.

What size fan do I need?

That depends on your specific application requirements for further advice we recommend you email or telephone CAS-Hire and one of your trained experienced staff will guide you to the appropriate equipment for your requirement.

What does CFM mean?

CFM Stands for Cubic feet per minute. CFM can be calculated by multiplying the air velocity by the cross-section area of a duct, you can determine the air volume flowing past a point in the duct per unit of time. Volume flow is usually measured in Cubic Feet per Minute (CFM). The concept of Air Velocity can be used in air conditioning, heating and ventilating work.

Are your fans noisy?

The Axial fans are noisier at high speed however most of our range offer variable fan speed control which can if set on low fan speed reduces noise levels significantly. Our carpet dryer fan is a centrifugal fan that has a significantly quieter operating noise level.

Can the fans or ventilators be used outside?

We have a selection of IP55 approved fans available on request.

Can the fans be ducted?

Only our PF400 and PV ventilator range of fans have duct able capability.

What length of ducts can be attached to the ventilator fans?

We recommend a maximum 5m length can be attached to either side of the fan before we recommend attaching an additional fan.

Do you have fans that operate using 110v?

We only have the Bluemax 950 fixed speed and the PF400 available in 110v versions.

Can your fans operate in hazardous areas?

We have specific (EX) ATEX approved fans available on request.

What is the largest fan you have?

Our Bluemax 950 is the largest fan we generally have in stock which has blades almost one metre in width however we can source larger fans if required within 3-7 working days.

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