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.
Silent & Maintenance-Free
42W high-efficiency solar panel provides quiet, clean energy operation.
Virtually silent performance with no ongoing maintenance required.
Built to Last
Durable aluminum construction that's rustproof and waterproof.
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 |
| Airflow | Up to 1200 CFM |
| Coverage Area | 2,200 sq/ft |
| Panel Size | 20.2" x 17.75" |
| 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 |
| Airflow | Up to 1200 CFM |
| Coverage Area | 2,200 sq/ft |
| Panel Size | 20.2" x 17.75" |
| 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 ※ |
Shipping Information
In stock - ships within 24 hours
Free standard shipping to US contiguous states
30-day money back guarantee
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
100-240V adapter ensures compatibility with any home
The hybrid power system ensures your attic stays ventilated day and night, 365 days a year.
DIY-Friendly Installation
Easily install your solar attic fan with our comprehensive DIY kit and resources
Video Guide
Step-by-step installation video
All Hardware
Everything included
Leak-Proof
Watertight design
Quick Setup
1-2 hours installation
FREQUENTLY ASKED QUESTIONS
Measure the square footage of your attic. Calculation Example
- Attic Size: 1,200 sq. ft.
- CFM Needed: 1,200 CFM (1 CFM per sq. ft.)
- Fan Capacity: Our fan moves 1200 CFM, you would need about 1 fan. (1,200 CFM ÷ 1200 CFM per fan = 1 fan.
We will ship it out within 48 hours.
It will take 3-5 days for you to receive by Ups.
We accept 30 days return .
We offer a 1-year free replacement and a 10-year limited warranty.Learn more