LANGY 42W Solar Attic Fan
Reduce HVAC Costs Up to 40% & Protect Your Home Year-Round
Key Features & Benefits
Slash HVAC Costs
Summer: Reduces attic temperatures by up to 40°F, lowering AC workload and energy bills.
Winter: Prevents moisture buildup, reducing mold, rot, and insulation damage risks.
Smart Thermostat Control
Built-in preset thermostat for automatic operation:
- Automatically starts at 77°F
- Automatically stops at 73°F
This feature can be disabled for manual control.
Quite & Maintenance-Free
42W high-efficiency solar panel provides quiet, clean energy operation.
Low noise level and no maintenance required
Built to Last
Steel support parts guarrantee solid structures and aluminum alloy frame delivers lightweight and conveniences
Hybrid solar + AC power ensures non-stop airflow 24/7.
Smart Thermostat Operation
The fan features intelligent thermostat control to optimize energy efficiency and maintain ideal attic conditions automatically.
The fan automatically activates when attic temperature reaches 77°F and stops when it cools to 73°F, maintaining optimal conditions without manual intervention.
Technical Specifications
| Model | SF-42 |
|---|---|
| Solar Panel Power | 18V/42W |
| Solar Panel Size | 20.2" x 17.75" |
| Airflow | Up to 1200 CFM |
| Coverage Area | 2,200 sq/ft |
| Adapter Voltage | 100-240V AC, 50/60 Hz |
| Fan Speeds | 8 levels |
| Controls | Built-in Preset Thermostat |
|---|---|
| Motor Type | DC 30W |
| Cap Dimension | 18.25" x 18.25" |
| Rough Cut-out | 12.3" x 12.3" |
| Flashing size | 22" x 22" |
| Remote control distance | 65ft |
| Warranty | 10 Years |
| Model | SF-42 |
|---|---|
| Solar Panel Power | 18V/42W |
| Solar Panel Size | 20.2" x 17.75" |
| Coverage Area | 2,200 sq/ft |
| Solar Panel Size | Up to 1200 CFM |
| Adapter Voltage | 100-240V AC, 50/60 Hz |
| Fan Speeds | 8 levels |
| Controls | Built-in Preset Thermostat |
| Motor Type | DC 30W |
| Cap Dimension | 18.25" x 18.25" |
| Rough Cut-out | 12.3" x 12.3" |
| Flashing size | 22" x 22" |
| Remote control distance | 65ft |
| Warranty | 10 Years ※ |
24/7 Hybrid Power Operation
The LANGY 42W's hybrid power system ensures continuous operation regardless of weather conditions, providing year-round attic ventilation.
Daytime Operation
Powered by high-efficiency solar panels using clean, renewable energy
42W solar panel provides ample power for maximum airflow
Night & Cloudy Days
Automatically switches to AC power when solar is insufficient or unavailable.
The adapter is a great supplement for the solar supply. And they can work independently.
The hybrid power system ensures your attic stays ventilated day and night, 365 days a year.
DIY-Friendly Installation
Installation is intuitive and a breeze
Video Guide
Step-by-step installation video
All Hardware
Everything included
Leak-Proof
Watertight design
Quick Setup
1-2 hours installation
Frequently Asked Questions
How many solar attic fan do I need?
Please measure the square footage of your attic. Here's a calculation example:
- Attic Size: 1,200 sq. ft.
- CFM Needed: 1,200 CFM (1 CFM per sq. ft.)
- Fan Capacity: Our fan moves 1,200 CFM, you would need about 1 fan. (1,200 CFM ÷ 1,200 CFM per fan = 1 fan)
What's the warranty of this fan?
We offer a 1-year free replacement and a 10-year limited warranty.Learn more.
Can I install it by myself?
Sure you can. No wiring is required. And the voltage(18V) is low and safe.
How long does shipping take?
We process orders within 1-2 business days. Free shipping takes 2-5 business days with UPS.
What is your return policy?
We offer a 30-day money-back guarantee on all products. Items must be in original condition. Please contact our support team to initiate a return.