"what is the difference between fan, blower and compressor?"

Easier to describe the characteristics and applications of each one.

1. Fan: Household with 4 to 6 blades in safety bird cage to provide a cooling breeze.

2. Industrial high capacity fan, essentially an over sized version of a household fan to provide fresh air ventilation for large shop areas.

3. Scroll casing and squirlcage rotors to move air at low pressures measured in inches of water in ducts for building heating, cooling and ventilation.

4. Blowers produce higher pressures or vacuums for special applications not requiring the precision of air compressors.

5. Air compressors produce high pressure compressed air for use with air operated tools for use where electrical tools pose a safety hazard, laboratory uses, etc.

Half of this is guesswork......sorry.

The previous info is quite accurate. I would add that fans are generally low pressure or low vacuum (depending on which side of the fan you are) and would be measured in inches of water gauge. I would suggest fans normally generate less than 5 psi differential pressure.

Blowers is the usual name for a device working on its own to create positive pressure ( above atmospheric pressure) or a vacuum (pressure below atmospheric). The standard Roots design is a two lobe blower and another version is a tri-lobed blower. The tri-lobed blower can be quieter. These can create a pressure of up to 1 bar, 15 psi, above atmospheric and 15 inches of Mercury vacuum, ie a 1/2 atmosphere below normal air pressure.

If a blower is used in conjunction with a another mechanical vacuum pump is is called a booster. It generally is then used to increase the mass of gas moved, cfm, and will also create a lower pressure (higher vacuum) than the mechanical vacuum pump alone. Vacuum levels can be in the range of 1/000th of a torr. (760 torr = std atmospheric pressure).

Compressors are used to create pressures in the range of 100 psi above atmospheric pressure (shop air), and multi-stage compressors can create pressures in the 1000s of psi. Compressors can be reciprocating type, often used in garages for tire air, and also twin screw type used in larger sizes for factory compressed air supply and other applications.

I hope this helps you.

Howard

Actually, a FAN is used to move air in a random movement, unconfined.

A blower is used to move air through a conduit such as a pipe.

A compressor is used to provide air at relatively high pressures through a conduit.

Now, there are, of course, refinements to these simple definitions, but the general terms are as I have stated.

Your FAN definition is not always true. The fan in your furnace blows/moves air along the ducts. (Or is that then a blower?)

There are lots of discussion points, I hope the original question has been answered, we haven't heard.

The fan in a furnace is more correctly called a blower. As a matter of fact, my furnace refers to this apparatus as a blower in the manual. Your avatar does not indicate your location, but if you are in the U.S. you may be familiar with W. W. Grainger, a supplier of nearly everything. Starting on page 3749 of their current catalog (#399) you will find many various types of "furnace blowers".

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