This fan moves air decently, has been reliable for the last few years. Many people want to know how much electricity this fan uses. I took some measurements with a Kill A Watt meter:
Speed Watts VoltAmps Power Factor
Low 54.5 56.9 .96
Medium 71 71 .99
High 92.3 95.4 .96
The fan is most efficient on the medium setting. Power factor bounced between 1 and .99. Power factor is a measure of how efficiently a device is using electricity. A measurement of 1 means that the power being used by the fan is 100% converted with none lost to heat or other electrical losses. A power factor less than one means that some of the electricity is being lost due to inefficiencies. So this fan is most efficient on the medium setting.
What is rarely calculated or provided on any consumer fan is the motors efficiency in CFM per WATT. This is the true measure of efficiency. A motor may be very efficient in not wasting electricity due to inefficiencies in its electrical design, but still move little air for the energy consumed. This is the only true way to compare efficiencies between different fans.
Unfortunately this is normally done in a special wind tunnel where the output of the fan can be exactly measured and then some simple math is done. There is also static pressure to take into account. The simple way to understand this is that it is the resistance to air movement that a fan must work against. If a fan is working to exhaust air out of a window, but the room has a small air intake where the fan must work harder to draw enough air, then the efficiency of the fan in CFM/WATT goes down.
For most of these box fans we are using them to blow air in a room and not as an intake or exhaust fan so we will dispense with static pressure. If you intend to stick this fan in a window to draw air in or out of your room, please keep in mind that it is only efficient when there is an opening in the room that is 1.5 times as large as the opening the fan is trying to draw air in or out of.
All of this being said, this particular fan is not the most efficient on the market. The Aerospeed BX100 uses less energy to move the same volume of air.
This fan is reliable, the price is not bad, but it is not the most efficient when comparing the amount of air moved to the energy consumed. Please see the attached images from the Kill A Watt meter for each fan speed.
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From the manufacturer
Lasko 3733 20" Fan Box In
With 3 quiet speeds, Save-Smart, and easy-to-use top mounted controls, this classic box fan is an excellent choice for any indoor space that needs increased airflow.
- Built-in carry handle
- Save-Smart--less than 2¢ per hour to operate
- 3 quiet speeds
- Made in the USA from domestic & imported parts
- The Blue Plug Patented safety fuse technology
- Simple no-tools assembly
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Reviewed in the United States on August 9, 2016
Speed Watts VoltAmps Power Factor
Low 54.5 56.9 .96
Medium 71 71 .99
High 92.3 95.4 .96
The fan is most efficient on the medium setting. Power factor bounced between 1 and .99. Power factor is a measure of how efficiently a device is using electricity. A measurement of 1 means that the power being used by the fan is 100% converted with none lost to heat or other electrical losses. A power factor less than one means that some of the electricity is being lost due to inefficiencies. So this fan is most efficient on the medium setting.
What is rarely calculated or provided on any consumer fan is the motors efficiency in CFM per WATT. This is the true measure of efficiency. A motor may be very efficient in not wasting electricity due to inefficiencies in its electrical design, but still move little air for the energy consumed. This is the only true way to compare efficiencies between different fans.
Unfortunately this is normally done in a special wind tunnel where the output of the fan can be exactly measured and then some simple math is done. There is also static pressure to take into account. The simple way to understand this is that it is the resistance to air movement that a fan must work against. If a fan is working to exhaust air out of a window, but the room has a small air intake where the fan must work harder to draw enough air, then the efficiency of the fan in CFM/WATT goes down.
For most of these box fans we are using them to blow air in a room and not as an intake or exhaust fan so we will dispense with static pressure. If you intend to stick this fan in a window to draw air in or out of your room, please keep in mind that it is only efficient when there is an opening in the room that is 1.5 times as large as the opening the fan is trying to draw air in or out of.
All of this being said, this particular fan is not the most efficient on the market. The Aerospeed BX100 uses less energy to move the same volume of air.
This fan is reliable, the price is not bad, but it is not the most efficient when comparing the amount of air moved to the energy consumed. Please see the attached images from the Kill A Watt meter for each fan speed.
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the price is not bad, but it is not the most efficient when ...
By Matthew Becker on August 9, 2016
This fan moves air decently, has been reliable for the last few years. Many people want to know how much electricity this fan uses. I took some measurements with a Kill A Watt meter:By Matthew Becker on August 9, 2016
Speed Watts VoltAmps Power Factor
Low 54.5 56.9 .96
Medium 71 71 .99
High 92.3 95.4 .96
The fan is most efficient on the medium setting. Power factor bounced between 1 and .99. Power factor is a measure of how efficiently a device is using electricity. A measurement of 1 means that the power being used by the fan is 100% converted with none lost to heat or other electrical losses. A power factor less than one means that some of the electricity is being lost due to inefficiencies. So this fan is most efficient on the medium setting.
What is rarely calculated or provided on any consumer fan is the motors efficiency in CFM per WATT. This is the true measure of efficiency. A motor may be very efficient in not wasting electricity due to inefficiencies in its electrical design, but still move little air for the energy consumed. This is the only true way to compare efficiencies between different fans.
Unfortunately this is normally done in a special wind tunnel where the output of the fan can be exactly measured and then some simple math is done. There is also static pressure to take into account. The simple way to understand this is that it is the resistance to air movement that a fan must work against. If a fan is working to exhaust air out of a window, but the room has a small air intake where the fan must work harder to draw enough air, then the efficiency of the fan in CFM/WATT goes down.
For most of these box fans we are using them to blow air in a room and not as an intake or exhaust fan so we will dispense with static pressure. If you intend to stick this fan in a window to draw air in or out of your room, please keep in mind that it is only efficient when there is an opening in the room that is 1.5 times as large as the opening the fan is trying to draw air in or out of.
All of this being said, this particular fan is not the most efficient on the market. The Aerospeed BX100 uses less energy to move the same volume of air.
This fan is reliable, the price is not bad, but it is not the most efficient when comparing the amount of air moved to the energy consumed. Please see the attached images from the Kill A Watt meter for each fan speed.
Images in this review
Reviewed in the United States on December 3, 2016
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