---
product_id: 104382782
title: "Lasko - 20\" Weather-Shield Performance Box Fan, 3-Speed (3720)"
brand: "lasko"
price: "€ 261.66"
currency: EUR
in_stock: true
reviews_count: 9
url: https://www.desertcart.pt/products/104382782-lasko-20-weather-shield-performance-box-fan-3-speed-3720
store_origin: PT
region: Portugal
---

# Weather-Shield motor for outdoor use Energy-efficient at < $0.02/hr 20" blade for max airflow Lasko - 20" Weather-Shield Performance Box Fan, 3-Speed (3720)

**Brand:** lasko
**Price:** € 261.66
**Availability:** ✅ In Stock

## Summary

> 🌬️ Stay cool, save smart, and breeze through every season!

## Quick Answers

- **What is this?** Lasko - 20" Weather-Shield Performance Box Fan, 3-Speed (3720) by lasko
- **How much does it cost?** € 261.66 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/104382782-lasko-20-weather-shield-performance-box-fan-3-speed-3720)

## Best For

- lasko enthusiasts

## Why This Product

- Trusted lasko brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Tool-Free Setup:** Unbox, snap, and chill—assembly so simple, you’ll wonder why all fans aren’t this easy.
- • **Weather-Shield Durability:** Rain or shine, this fan stays put—ideal for open windows and fresh air lovers.
- • **Innovative Wind Ring System:** Boosts airflow by 30% without extra power—feel the difference, not the cost.
- • **Save-Smart Energy Efficiency:** Keep cool without the guilt—runs under 2¢ per hour, year-round savings.
- • **Whisper-Quiet 3-Speed Control:** Tailor your breeze with silent precision—perfect for work or rest.

## Overview

The Lasko 20" Weather-Shield Performance Box Fan combines powerful airflow with whisper-quiet operation and energy efficiency, costing less than 2¢ per hour to run. Its patented Weather-Shield motor allows safe use in open windows, while the innovative Wind Ring System increases air velocity by up to 30% without extra energy consumption. Designed for easy, no-tools assembly and versatile mounting options, this fan is a durable, cost-effective cooling solution for any room or season.

## Description

This high-performing box fan from Lasko features a patented Weather-Shield motor for worry-free window use, plus a high performance grill for ultimate air flow. Three speeds and Save-Smart (costs less than 2¢ per hour to operate) make this an ideal fan for any room where you need to increase cooling airflow.

Review: Better than average quality - Good quality fan. Sturdy build and not too noisy.
Review: Powerful yet quiet 20" box fan - This Lasko 20" box fan is powerful but quiet on low speed. I have one that is more than 15 years old and still works well. During a heat spell, I bought a second one, and it is just as effective. I highly recommend the Lasko 20" box fan for quiet but effective cooling.

## Features

- 3 Quiet Speeds - makes this fan ideal for the bedroom, living room, kitchen, or home office. The quiet yet powerful motor provides a cooling breeze throughout the room.
- Save-Smart - means you'll pay less than $0.02 per hour to operate the fan. Combine this with up to 30% more air velocity and you have an energy efficient fan to use year round.
- Weather Shield Motor - allows you to use the fan worry free in an open window. Thanks to the weather shield motor you can leave the fan in place during minor rain.
- Innovative Wind Ring System - is designed to increase air velocity without increasing power consumption. This allows the fan to circulate more air compared to traditional fans.
- Simple No-Tools Assembly - allows you to take the fan out of the box and have it working in seconds. Just clip the stabilizing feet onto the fan, stand up the fan, and it's ready to use.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07NLJB35W |
| Best Sellers Rank | #2,313,692 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #681 in Floor Fans |
| Blade Material | Plastic |
| Brand | Lasko |
| Brand Name | Lasko |
| Collection Name | Home,Kitchen,Living Room,Office |
| Color | Standard |
| Control Method | App |
| Controller Type | Manual controls |
| Customer Reviews | 4.1 out of 5 stars 163 Reviews |
| Electric Fan Design | Window Fan |
| Electric fan design | Window Fan |
| Finish Type | White or Cream |
| Global Trade Identification Number | 00046013418807 |
| Included Components | Plastic Feet |
| Indoor Outdoor Usage | Indoor |
| Installation Type | Floor Mount, Window Mount, Wall Mount |
| Item Dimensions D x W x H | 4.75"D x 21.25"W x 22.5"H |
| Item Type Name | Household Fans |
| Item Weight | 8.3 pounds |
| Manufacturer | Lasko |
| Material | Plastic |
| Model Name | Lasko - 20" Weather-Shield Performance Box Fan, 3-Speed (3720) |
| Model Number | 3720 |
| Mounting Type | Floor Mount, Window Mount, Wall Mount |
| Number of Blades | 5 |
| Number of Power Levels | 3 |
| Number of Speeds | 3 |
| Part Number | 3720 |
| Power Source | Corded Electric |
| Product Dimensions | 4.75"D x 21.25"W x 22.5"H |
| Recommended Uses For Product | Bedroom, Home |
| Room Type | Bedroom, Living Room |
| Size | 20" |
| Special Features | Energy Efficient |
| Specification Met | no |
| Standby Power Shutoff | Energy-efficient, high-performing |
| Style | Traditional |
| Switch Type | knob |
| Theme | Household Fans |
| UPC | 046013418807 |
| Unit Count | 1 Count |
| Wattage | 20 watts |

## Product Details

- **Brand:** Lasko
- **Color:** Standard
- **Electric fan design:** Window Fan
- **Mounting Type:** Floor Mount, Window Mount, Wall Mount
- **Power Source:** Corded Electric
- **Product Dimensions:** 4.75"D x 21.25"W x 22.5"H
- **Recommended Uses For Product:** Bedroom, Home
- **Room Type:** Bedroom, Living Room
- **Special Feature:** Energy Efficient
- **Style:** Traditional

## Images

![Lasko - 20" Weather-Shield Performance Box Fan, 3-Speed (3720) - Image 1](https://m.media-amazon.com/images/I/81y6PL60EIL.jpg)
![Lasko - 20" Weather-Shield Performance Box Fan, 3-Speed (3720) - Image 2](https://m.media-amazon.com/images/I/71eBJp+8irL.jpg)
![Lasko - 20" Weather-Shield Performance Box Fan, 3-Speed (3720) - Image 3](https://m.media-amazon.com/images/I/716KJqRH3NL.jpg)
![Lasko - 20" Weather-Shield Performance Box Fan, 3-Speed (3720) - Image 4](https://m.media-amazon.com/images/I/61lDm8lzAWL.jpg)
![Lasko - 20" Weather-Shield Performance Box Fan, 3-Speed (3720) - Image 5](https://m.media-amazon.com/images/I/71pGB7tS8XL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Better than average quality
*by R***2 on July 6, 2026*

Good quality fan. Sturdy build and not too noisy.

### ⭐⭐⭐⭐⭐ Powerful yet quiet 20" box fan
*by J***E on June 11, 2026*

This Lasko 20" box fan is powerful but quiet on low speed. I have one that is more than 15 years old and still works well. During a heat spell, I bought a second one, and it is just as effective. I highly recommend the Lasko 20" box fan for quiet but effective cooling.

### ⭐⭐⭐⭐⭐ Works without fail
*by C***N on November 5, 2025*

I have this thing on 15 hours a day, in use for a CR box. It reliably runs at any speed.

## Frequently Bought Together

- Lasko - 20" Weather-Shield Performance Box Fan, 3-Speed (3720)
- Lasko Wind Machine Air Circulator Floor Fan, 3 Speeds, Pivoting Head for Large Spaces, 20", 3300, White
- Genesis 20" Box Fan, 3 Settings, Max Cooling Technology, Carry Handle, Black (G20BOX-BLK)

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.pt/products/104382782-lasko-20-weather-shield-performance-box-fan-3-speed-3720](https://www.desertcart.pt/products/104382782-lasko-20-weather-shield-performance-box-fan-3-speed-3720)

---

*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-08-11*