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Internet #203749141

Model #3720

Store SKU #400327

20 in. 3-Speed Weather Shield Performance Box Fan

  • 3 speed box fan with Weather-Shield design for window use
  • Operate for less than 2 cents per hour with 30% more air velocity
  • Lightweight design with built-in handle and patented safety plug
  • See More Details

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Product Overview

Step up to Lasko's 3-Speed Weather Shield Performance Box Fan and enjoy the benefits of the Wind Ring system, featuring an exclusive grill design that focuses the air movement to increase its velocity. This high-performance fan runs on three quiet speeds and includes the exclusive Weather-Shield motor, making it safe to use in windows. Lightweight and easy to carry, it costs just two cents an hour to operate, helping you save on energy costs without sacrificing power.
  • Patented, isolated weather-shield motor for worry-free window use
  • 3 quiet speeds won't disrupt the room or surrounding area
  • Top-mounted controls make it easy to operate
  • Easy-carry handle for portability
  • High-performance grill is uniquely designed for ultimate airflow
  • Save-smart design costs less than two cents per hour to run
  • Wide body provides floor stability despite its lightweight frame
  • Patented, fused safety plug ensures worry-free operation
  • 2-year limited warranty
  • ETL listed for safety
  • Click here for more information on Electronic Recycling Programs

Info & Guides

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BrandLaskoLaskoGENESISLasko
Name20 in. Power Plus Box Fan20 in. 3-Speed Weather Shield Performance Box Fan20 in. Black 3-Speed Settings Box Fan with Max Cooling TechnologyAir Flex 20 in. 3- Speed Air Purifier and Room Fan
Price
Ratings
(848)
(175)
(1)
(10)
Product Width (in.)4.75 in222021.3 in
Product Height (in.)22.5 in4.52023.2 in
Housing MaterialSteelPlasticPlasticPlastic
Fan diameter (in.)20202020
Fan FeaturesGroundedGroundedBuilt-In Carry Handle,Built-In Circuit Breaker,High Velocity,Slip-Resistant FeetBuilt-In Carry Handle,High Velocity,Slip-Resistant Feet
Number of Fan Speeds3333
Power TypePlug-InPlug-InPlug-InPlug-In
Indoor/OutdoorIndoorIndoorIndoorIndoor
Cord Length (ft.)6666.0
View ProductView ProductView ProductView Product

Specifications

Dimensions

Fan diameter (in.)
20
Product Depth (in.)
21.5
Product Height (in.)
4.5
Product Width (in.)
22

Details

Assembly Required
No
CFM
2095
Color Family
White
Color/Finish
White
Cord Length (ft.)
6
Decibel (Sound) Rating
01-Not Measured
Fan Features
Grounded
Fan Type
Box Fan
Housing Material
Plastic
Indoor/Outdoor
Indoor
Mounting Type
Standalone
Number of Fan Speeds
3
Power Type
Plug-In
Product Weight (lb.)
10.10
Returnable
90-Day
Voltage (volts)
120
Wattage (watts)
90

Warranty / Certifications

Certifications and Listings
ETL Listed
Manufacturer Warranty
2 year limited

Questions & Answers

9Questions29Answers

Is the bearing/motor on this model able to support running the fan horizontally (pointing the air...

Asked by horizontalFanGuy June 25, 2020
1
Answer

Hi, this has a sealed type motor, so it will not leak, nor can you add oil. The life span of any product is determined by the manufactures warranty, as they will not warranty any product beyond its expected life span, so if they say oh a product should last for 10 years but we only give it a 1 year warranty as a industry standard what they are really saying is a certain percentage of these units fail after certain period of time then use that to determine with the warranty period ends. As they do not want to have to replace or repair failing units as that would cause a loss of profit. Since this comes with a 2 year warranty I would say yes this will work like that for its expected life span.

How does this compare with the Lasko 20 in. 3-Speed Box Fan (model #3733)? Is it better, safer? ...

Asked by David July 27, 2019
5
Answers

I have bought one and placed it in a screen window for a livestock building. Haven't had a problem with it yet even after a couple rain showers.

The specs show the height as 4.5 in. Doesn't sound right. Could you please provide exact measurem...

Asked by Willow67 April 16, 2019
6
Answers

The metal fan box is 20-1/4" square. From the floor to the top of the handle is 22-1/2"

Do you use the window screen behind the fan when its installed in the window?

Asked by Peg September 14, 2017
5
Answers

Yes, weather blowing air out or bringing air in I keep the screen in place.

Wiring diagram for this fan

Asked by clos November 28, 2016
1
Answer

That is proprietary information.

what is the RPM of each variable speed of the fan?

Asked by collin May 15, 2016
0
Answers

Can this be wall-mounted?

Asked by Kate June 28, 2015
5
Answers

Don't think. there are two small mounting slots on the bottom for these plastic stand pieces to keep the fan from tipping over. Possibly rig it up somehow to wall mount. But nothing straight straightforward

How much energy does it consume?

Asked by Pichi17un June 9, 2015
4
Answers

Low 80 High ~100-120

CFM?

Asked by ValuedCustomer May 12, 2015
2
Answers

But is it the same fan? That one has complaints of being noisy. This one is supposed to be super quiet. One would suppose that would change the CFM. Does it?

Customer Reviews

  • 4.1
    out of 175 reviews
  • 74% recommend this product
Filter by:
Showing 1-10 of 175 reviews
It will not stand up unless you install the feet, which stick out about 3 inches. So tough luck i...
It will not stand up unless you install the feet, which stick out about 3 inches. So tough luck if you wanted to put it right against a screen door/window screen. The plug has a non-replaceable fuse so if there's a power surge, your $30 fan is trash. Unless you re-wire the plug. QC issues. The metal on the bottom and top of my unit was bent (appeared to be from the factory - no obvious point of impact) so the plastic frame doesn't sit flush against the metal. Also causes it to not sit well on the floor and wobble. Fan blade contributes: it is better balanced than a lot, but still enough to make the fan vibrate. Other than that it's a good fan though. Circulates air well, isn't super loud.
by bskfnqlqndjekenr
1 person found this helpful
I bought this same model fan (3720) from HD about 15 years ago for use in a server room. I use it...
I bought this same model fan (3720) from HD about 15 years ago for use in a server room. I use it to help circulate air and prevent hot spots in the server room. It has operated 24/7 (even in the winter) for those 15 years, never missing a beat. Honestly, I wondered if it would ever wear out. Today, it did... but wow what a quality made product! I was so surprised it was still in production as I went to look for a replacement I had to write a review. If you need a good box fan that will last. Buy this one!
by ComputerGuru
9 people found this helpful
Haven't had for very long, and we don't run them all the time-- we use to push smoke and odors ou...
Haven't had for very long, and we don't run them all the time-- we use to push smoke and odors out of the house. But the air-power is good, the various speeds are what they should be, and the motor seems strong. Comes with a set of plastic feet stabilizers that attach by fitting into notches in the body & these are very cheap. One was defective and wouldn't fit into place; others fit, but did not stay in place. HD is having replacement feet sent though, so aside from this minor inconvenience, I'm pleased with the product.
by GusApache
1 person found this helpful
I use it as exhaust fan in a 20 in. casement window. Perfect fit, held in place with elastic cor...
I use it as exhaust fan in a 20 in. casement window. Perfect fit, held in place with elastic cord. With a window open on the opposite side of the house it ventilates the house at night or any other time it's too hot inside and cooler outside. The weatherproof feature is a nice touch. Exactly what I needed.
by JimBob
5 people found this helpful
Great airflow
I use this to circulate air thru my whole house. I put it in my bedroom facing outward and it pulls air in from across the house. Love it.
by Shorty
5 people found this helpful
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
by HomeDepotCustomer
1 person found this helpful
I have always used lasko fans in our barn stalls for our horses. For the additional cost of the p...
I have always used lasko fans in our barn stalls for our horses. For the additional cost of the performance modrl I wouldn't recommend wasting your money. The grills are so cheap a child could easily push a finger through. The blades are so out of balance that the fan shakes quite a bit. I purchased 4 fans and tgey all are the same. I've had the fans for 3 weeks.
by fanguy
I have been using this brand over the years and have been very pleased. I purchase at least 5-6 f...
I have been using this brand over the years and have been very pleased. I purchase at least 5-6 fans per season. The past 2 seasons they all have either stop working or horribly wobble within 1 day to 2 months. The quality control and quality has definitely gone down hill.
by Dissatisfiedone
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
Showing 1-10 of 175 reviews