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Squirrel Cage Fan

Updated on March 29, 2012

Squirrel Cage Fan or Centrifugal Fan or Blower Fan

Squirrel cage fan is a mechanical equipment for moving gases, especially air. Squirrel cage fan also known as centrifugal fan or blower fan. Squirrel cage fan has a fan wheel developed of a number of ribs or fan blades and mounted around a hub. Squirrel cage fan looks like a hamster wheel.

The hub of its device turns on a driveshaft that passes through the fan housing. The air enters from the side of the fan wheel, turns 90 degrees and accelerates due to centrifugal force as it flows over the fan blades. The least the air exits the fan housing.

In this lens we will explore our curiosity about squirrel cage fan or blower fan. Happy reading.

The picture is taken from this website

Centrifugal Fan

Centrifugal fans can generate pressure improves in the gas stream. Accordingly, they are well-suited for industrial processes and air pollution control systems. Centrifugal fans usually applying in central heating or cooling systems. First centrifugal fan was recorded in 1832 by Russian military engineer Alexander Sablukov. He invented its usage both in the Russian light industry (such as sugar making) and abroad.

The main components of a common centrifugal fan among the fan wheel, drive mechanism, fan housing and inlet and/or outlet dampers. Fan wheels can separated into three major drives, they are direct drive, belt drive and variable drive.

Bearing is very important part of blower fan. Sleeve-ring oil bearings are applied extensively in fans. Many sleeve-ring bearings may be water cooled. They are used when hot gases are being moved by the fan. Heat is directed through the shaft and into the oil which must be cooled to prevent overheating of the bearing. Since lower speed fan which has a bearings in tough-to-get-to spots, Grease-packed anti-friction bearings are used.

Fan dampers are important too to control gas flow into and out of the squirrel cage fan. Fan dampers might be installed on the inlet side or on the outlet side of the fan, or both. The difference is dampers on the outlet side impose a flow resistance that is used to control gas flow; and dampers on the inlet side are used to control gas flow by changing the volume of gas or air admitted to the fan inlet.

How Swamp Cooler Works - Swamp Cooler can Works By Using Squirrel Cage Fan

The picture on the left depicts a roof top, or down draft, whole house swamp cooler.

A small motor (top) drives the squirrel cage fan in the center of the unit. Centrifugal force expels air from the blower housing while fresh air flows in to fill the area of lower pressure. The in-rushing air is pulled through damp cooler pads behind the louvres. The resulting evaporation cools the air 15°– 20°.

The fan continues its work by directing the cooled air through a ceiling duct to the rooms below which pushes the warm air outside through partially opened windows. A single window opened 2 - 3 inches in each room should be enough to exhaust the warm air.

Much research has gone into the design of cooler pads and materials. Aspen pads are effective and inexpensive, easy for the home owner to change, and are biodegradable when disposed of properly. Synthetic fibers cost a little more and may last longer, but they are seldom biodegradable and don't really cool much better than natural pads.

Typically a swamp cooler will have a float valve in the reservoir to maintain the water level. This keeps water usage to a minimum but promotes the build up of scale on the pads and reservoir pan.

To counter this problem, some coolers have been designed with a bleed off valve that periodically drains water from the reservoir or a "sump dump" that flushes out the contents of the reservoir including debris that accumulates from natural Aspen pads.

Both of these systems reduce scaling and keep the pads working efficiently, but they also use substantially more water than a float system.

The capacity of an evaporative cooler is measured in CFM, (cubic feet per minute). This is the amount of air, in cubic feet, a swamp cooler will push through your home in one minute.

A small window unit may be 2,500 CFM, while a whole house unit will be 6,000 CFM or larger. Whether it is for a single room or a whole house, there is a simple formula for determining the proper size of swamp cooler you need.

Figure the cubic feet of space you want to cool, and then divide that number by two. The quotient will give you the CFM rating for the proper-sized swamp cooler. For example, if you have a 1,500 square foot home with 8 foot-high ceilings:

1,500 x 8 = 12,000 cubic feet 12,000 % 2 = 6,000 CFM needed

Credit photo alternative heating info

Best Selling Squirrel Cage Fan

Many brands of squirrel cage fan available in the market today. You can select one of them suitable with your requirements. Here a five of top selling on Amazon online retail.

Lasko 4900 Pro-Performance High Velocity Utility Fan-Features Pivoting Blower and Built-in Outlets
Lasko 4900 Pro-Performance High Velocity Utility Fan-Features Pivoting Blower and Built-in Outlets

I saw no reviews on this fan, so I felt compelled to let you know my experience. I would recommend this fan over ANY other fan without hesitation. The Lasko 4924 is a space saving high velocity blower and has the power of a 20 in. floor fan. The slim design will allow you the space you need without compromising your work area. The oscillation for wide range coverage and directional louvers provide air flow where it is needed. Portable and powerful for any job, this fan will go with you on any job and will supply the force to get things cool and done.

Panasonic FV-05VF2 WhisperFit 50 CFM Low Profile Ceiling Mounted Fan, White
Panasonic FV-05VF2 WhisperFit 50 CFM Low Profile Ceiling Mounted Fan, White

You may look at the price of this fan and say, "Hey! I can buy four fans at Home Depot for that amount!" And those four fans will be noisy, rattling affairs that won't move air and won't last a year. This baby is dead silent (really - I had to get on a step ladder next to it to make sure it was on) and yet it moves 50 CFM with an oversize squirrel-cage fan (the secret) and an excellent solid state Panasonic motor. If you want to do the job right (and only once) spend the money - buy this fan! (And no - I don't work for Panasonic or own their stock.)

Hurricane 180 CFM Blower
Hurricane 180 CFM Blower

180 CFM Squirrel Cage Exhaust Fan. Exhaust fans are the most efficient way to combat both C02 loss and high temperatures, two things that can hinder your plants. They are set up to either blow air to another room or down a long tube to the outdoors. How do you know what size you need? Calculate the CFM (Cubic Feet per Minute) by dividing the cubic footage in your grow room by five. The blower you will choose based on this will be large enough to replace all of the air in the room in five minutes.

Squirrel Cage Shaded Pole Blower Fan 463 CFM
Squirrel Cage Shaded Pole Blower Fan 463 CFM


Product Features

* Without power cord

* You can draw air from multiple locations by placing the blower inside a box.


Lasko Innovators Squirrel Cage Fan - Lasko Innovators Squirrel Cage Fan Customer Review

It is a centrifugal fan (also known as a radial or squirrel cage), so it creates high velocity but not high pressure. You can really feel the air flowing into you, but if you put anything between you and the fan, forget it. It is very loud for its size. It does also require more energy to operate.

Lasko Innovators in Home Comfort MAX Performance Pivoting Utility Fan
Lasko Innovators in Home Comfort MAX Performance Pivoting Utility Fan

I did not give this fan a 5-star rating for one reason: maintenance. The manufacturer did not make this fan easy to clean. After a few years of use, its performance had a very noticable drop. I spent a lot of time getting this thing open, and when I finally did the source of performance degredation was obvious. Trapped inside the center of the impeller was a great amount of dirt/lent. The blades also had a big buildup of grime. The fan was actually functioning as an air cleaner, but that was clogging it. There is absolutely no way you can clean this fan without opening it up, and opening it up was not easy.


Stanley High-Velocity Squirrel Cage Fan - Stanley High-Velocity Blower Fan Customer Review

I purchase one of these fans to removing a standard 10 inch personal fan to applying at work that just wasn't keeping up. For your information, I am an electronics technician, and use it to both stay cool, and to keep the air where I am working clear of fumes and dust.

Lasko Stanley High-Velocity Blower Fan, 655702
Lasko Stanley High-Velocity Blower Fan, 655702

Something to note, it fits in a standard upright locker. I store it in mine at work ever day. I actually hang it by its handle on the coat hooks in the top-back of the locker, leaving room for my tool box in the bottom of my locker. though this might not work for you if your locker has junk hooks as this fan weighs in at more than 8 lbs. Mine has stood up to this sort of use well. It still has minimal scratches and dings on it.


Lasko Pro Performance Squirrel Cage Fan - Lasko Pro Performance Squirrel Cage Fan Customer Review

Hey guys, I must tell you that this Lasko squirrel cage fan is very impressive. I've bought this fan for well over 5 years ... and it works just as good as first day.

It's exceptionally quite because it uses a turbine - not blades. It moves a vast amount of air, even on low speed. It would blow away any typical $15 box fan. I'd be willing to bet that it would outperform an 18" Patten high velocity air circulator! It's also better than the similar looking Stanley, which get high marks from reviewers here.

Lasko 4900 Pro-Performance High Velocity Utility Fan-Features Pivoting Blower and Built-in Outlets
Lasko 4900 Pro-Performance High Velocity Utility Fan-Features Pivoting Blower and Built-in Outlets

I found that the Stanley is a smaller less powerful fan and it's not built as tough. Remember to compare the size and weight and you'll see a difference. For an extra $10, this fan is a much better buy.


Squirrel Cage Fan Gallery - Here a few of squirrel cage fan pictures. You can get more on the net

Yes, there are many size and brands of squirrel cage fans available in the market. Above just a gallery of them. You can meet a large ones by CLICK HERE

Do You Like Squirrel Cage Fan?

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      7 years ago

      These are pretty interesting - great lens! Very informative.


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