Lasko 3720 Fan, 20" 3-Speed Weather-Shield Performance Box - White

Brand: Lasko
Model: 3720
Condition: New
SKU: 10635
5 (3 Reviews)
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For your convenience, we recommend:


Step up to the Premium Box Fan and enjoy the benefits of the Wind Ring System, an exclusive grill design that focuses the air movement, increasing its velocity.

  • Patented, isolated weather-shield motor for worry-free window use
  • High performance grill for maximum air flow
  • 3 whisper-quiet, energy-efficient speeds
  • Can be used safely in the window or on the floor
  • Wider Body for Greater Floor Stability
  • U.L. Listed
  • Wattage: 110W
Limited Three Year Warranty Through the Manufacturer

Most Lasko heaters come with a three-year warranty against product defects from the date of purchase. After inspection by a Lasko service employee, the product will be determined defective or not and will have the option of being fully replaced or fixed. The warranty does not stand if the product is proven damaged due to improper handling/operation by the consumer, accidents, attempted repairs or other owner actions that void the warranty.

Lasko Products, Inc.
820 Lincoln Avenue
West Chester, PA 19380
Phone: 610-692-7400
Toll-free: 800-233-0268
Customer Reviews


this is by far the best fan ever better then some of those box fans you see today in stores.


on 08-24-2012 by FAN-MAN

Great Idea! Great Product!!

We own 3 of these. They run 24 hrs a day. We change filters every 1-3 months, depending on which room they are in ... meaning: one room has parrots, so there's always a dander problem. It may not take the microfine particles out of the air, but the filter grabs everything else possible. (We use negative ions for the remaining dust floating around -and- vacuum A LOT!) I could not imagine what it was like BEFORE we bought these. They work great!!! Triple A+++!!!

If you own birds, I'd recommend buying 1 (or more) or these ... try it out. You'll be glad you did. On another note, I could just duct tape a 20" X 20" air filter to a basic 20x20 fan .. but these "Look Nice" and are easy to change filters. (2) Two clips, that's it.


on 02-08-2011 by DWO


excellent service, long lasting despite usage


on 04-19-2009 by roro

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