Large attics present a different ventilation challenge. A fan that performs well in a compact attic may not provide enough airflow for a larger or more complex space. Contractors may also encounter homes where the roof configuration makes installing two smaller fans difficult or impractical.
The Attic Depot 70W Solar Attic Fan was designed for these demanding applications. Producing up to 3,850 CFM, it is recommended for attics up to 2,500 square feet.
High-Capacity From One 70W Solar Attic Fan
The 70W model is the highest-capacity solar attic fan offered by The Attic Depot. Its 70-watt adjustable solar panel powers a variable-speed 24-volt brushless motor that produces up to 3,850 CFM under appropriate operating conditions.
This makes it an excellent option for large attics and for roof configurations where two 30W fans will not fit properly.
The adjustable panel allows the installer to orient the solar collector toward stronger sunlight instead of depending entirely on the direction of the roof surface. This flexibility can be especially valuable when selecting a location that supports both strong solar exposure and effective attic airflow.
Designed for Attics Up to 2,500 Square Feet
The 70W Solar Attic Fan is recommended for attics up to approximately 2,500 square feet. However, square footage is only one part of proper fan selection.
Contractors should also evaluate:
- Attic volume and configuration
- Roof pitch
- Available intake ventilation
- Existing exhaust ventilation
- Obstructions within the attic
- Solar exposure
- Local climate
- The location of HVAC ducts and equipment
- Signs of elevated temperature or moisture
An attic with divided sections, blocked intake vents or an irregular layout may require a different ventilation approach than an open attic of the same size.
Automatic Temperature and Humidity Response
The 70W model includes an automatic thermostat and humidistat to help address both attic heat and moisture.
The controls are designed to operate at the following approximate settings:
- Temperature activation at 85°F
- Temperature shutoff at 70°F
- Humidity activation at 75%
- Humidity shutoff at 60%
When adequate solar energy is available, these controls allow the fan to respond automatically as attic conditions change. No wall switch or connection to the home’s electrical system is required.
Commercial-Grade Features
The 70W Roof-Mount Solar Attic Fan includes:
- Adjustable 70-watt solar panel
- Up to 3,850 CFM
- Recommended for attics up to 2,500 square feet
- Variable-speed 24-volt brushless motor
- Automatic thermostat and humidistat
- Whisper-quiet poly-vinyl blades
- Corrosion-resistant powder-coated finish
- Protective wildlife screen
- Hail- and wind-resistant design
- 27.5-inch by 29-inch by 12.5-inch construction
- No electrical operating cost
- No connection to household electrical power required
The fan is engineered to deliver substantial airflow while maintaining the quiet operation expected from a modern brushless motor system.
Intake Ventilation Is Essential
A high-CFM fan needs adequate intake air. If the soffit vents are blocked, undersized or covered by insulation, the fan may not be able to move its rated volume of air through the attic.
Before installation, contractors should confirm that the attic has a continuous, unobstructed airflow path from the intake vents to the proposed exhaust location. Insulation baffles, soffit openings and rafter channels should all be inspected.
This step is particularly important with a 3,850 CFM fan. Increasing exhaust capacity without addressing intake restrictions does not create a balanced ventilation system.
One Large Fan or Two Smaller Fans?
There is no universal answer. Two smaller fans may provide better distribution in some divided or elongated attics. In other homes, space limitations or roof design may make one high-capacity fan the more practical installation.
The 70W model is particularly useful when:
- The attic is too large for one 25W or 30W fan.
- Two smaller roof-mounted fans will not fit.
- The roof has a suitable centralized installation location.
- Strong solar exposure is available.
- The attic has enough intake ventilation to support higher airflow.
- Both temperature and humidity control are desired.
The final recommendation should be based on an attic inspection rather than square footage alone.
Designed and Distributed Exclusively by The Attic Depot
The 70W Solar Attic Fan was designed by The Attic Depot and is manufactured to our specifications. It carries The Attic Depot branding and is distributed exclusively through our professional contractor network.
The Attic Depot is a business-to-business supplier and does not sell directly to homeowners. Authorized contractors receive access to product education, installation resources, marketing materials and sales support that help them present attic ventilation professionally.
Lifetime Product Warranty
The complete 70W Solar Attic Fan is protected by a lifetime warranty against manufacturing defects. Labor and installation costs are not included.
Contractors interested in offering this high-capacity solar attic fan can apply to become an authorized The Attic Depot dealer. Homeowners can use The Attic Depot’s dealer locator to find a contractor who can inspect the attic and determine whether the 70W model is the correct solution.
