Lasko 3733 20" Fan Box, Gray/White
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The Lasko 3733 Slim 20 In. Box Fan features three quiet speeds for high volume air movement. The rounded corners offer provided safety while the slim design allows for easy placement no matter where you put it. Put it in a window, on the floor in a bedroom, living room, office or anywhere you need a fan. Plus, with the Save-Smart design, this fan costs less than 2-cents per hour to run! Package Content: 20 in. box faninstructionswarranty
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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.
I've lived in Thousand Oaks, Ca., since 1980. When I moved here, the climate was heaven on earth. Seriously hard to beat it, except maybe for San Diego. But after some years, climate change started, and it has now gotten serious. Around about 2006, the last two weeks of July have been murderous, hitting over 100 degrees daily for that span. The problem is that after our "May Gray" and "June Gloom," we're not ready for it, especially as so many homes here were built w/o air conditioning because we just didn't need it back in the day. Those days are gone. And we have August, September (maybe the hottest month), and October (Santa Ana winds) to come.
Since all that started, Lasko fans have saved our butts! All fans were sold out completely here this past weekend, so I just purchased two of these fans, and the predicted delivery was set for two weeks from then. Sold by HD Online, I got them in TWO DAYS!!!
All box fans come with fused plugs, and that's good. You can't replace these fuses if they blow, but you can replace the plug, I presume, but if the mfg. is fusing the plug, they're doing so for safety reasons you may not want to bypass, 'k? And if the fuse does blow, you have a problem you REALLY need to fix.
My first Lasko lasted over 15 years. My second lasted 3 years until it got knocked over while running at high speed, and that broke a fan blade, unsurprisingly. (Anything rotating at high speed that gets knocked over on a hard floor is gonna break). So I got two more, and they're great. Noisy at high speed, but all propellers are; at low speed, it's wonderful for white noise that puts you to sleep. I bought two for a "push-pull" effect. Here, it's almost always cool in the morning, so open a door at one end of the house to push cool air into the house, then put the other fan in a window at the other end to pull the cool air through the house. Works like a charm and drops interior temperature, especially when using a ceiling fan along the air path that pulls the cool air up to the ceiling.
Look, for this price, this fan, for what it does, is almost free. It uses very little power (see reviews above) and moves a good amount of air. NOTE: If you use this on the floor, install the feet with the extensions on either side of the cord on the fan frame to keep the fan from pushing itself over. When mounting in a window, close the window firmly onto the fan's frame for the same reason.