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20″ Power Plus Box Fan

Model 3721

Lasko’s 20″ Power Plus box fan features the powerful Weather-Shield® motor for worry-free window use. Its innovative Wind Ring® system is engineered to provide 30% more air velocity. A wider steel body offers greater stability and durability.


  • Patented Weather-Shield® motor for worry-free window use
  • Built-in carry handle
  • 2-year limited warranty
  • Energy efficient operation
  • Innovative Wind Ring® system for 30% more air velocity
  • 3 quiet speeds
  • Made in the USA from domestic & imported parts
  • The Blue Plug™ Patented safety fuse technology
  • Simple no-tools assembly
  • E.T.L. listed


  • Size/Height: 21.25"L x 4.75"W x 22.5"H
  • Weight: 10.17 lbs
  • Remote: No
  • Controls: Manual controls