Welcome to Solar Powered Soffit Fans LLC


EFFICIENT & COMPACT SOLAR VENT FAN KITS FOR ATTICS, CRAWL SPACES, GARAGES, CABINS, SHEDS, & VEHICLES. CUSTOM SOLUTIONS, TOO.

Solar Attic Soffit Vent Fans

SPSF 430D

Solar Powered Attic Soffit Vent Fans

Attic soffit vents, under the roof eaves and overhangs, are generally recognized as the best type of passive attic ventilation. They allow the attic to "breathe" with little risk of  leaks and wind damage risks. In some cases, wind driven cross flow of air through the soffit vents is all the ventilation the attic needs. If it isn't enough, Solar Powered Soffit Fans are the best type of powered attic ventilation, using the same soffit vents and the sun to naturally ventilate the attic. Solar Powered Soffit Fans blow fresh air IN horizontally across the bottom of the attic, just above the ceiling, where it matters the most. Hot air in the attic is cooled, displaced, and forced OUT of the other passive attic vents, reducing the attic temperature and moisture. Some advantages include-


  • No fan, screw, nail, or vent holes in the roof to leak.
  • No reason to go on the roof or hire a contractor to install or repair a fan (or a leak). 
  • No reason to go into the attic to install or repair a fan.   
  • No need for an AC electrical power circuit. 
  • No need for complex controls. 
  • No need for code permits or inspections (typically).  
  • No attic exhaust fan negative pressure to pull air conditioned air out of the house and into the attic, or attic exhaust fan risk of pulling carbon monoxide from fired appliance exhaust into the house. 
  • Fewer airflow CFMs are needed than with roof and gable fans.
  • Can be used with shingle, tile, and metal roofs without problems, because they are not located on, or attached to, the roof
  • Work with your existing attic vents and improve the attic ventilation and cooling, using free power from the sun. Enhance the performance of existing attic and gable vent fans, ridge vents, gable vents, turbines, J and mushroom vents, etc.
  • For enclosed cathedral ceilings, they can be arranged to move air in each rafter bay in the gap between the roof and the ceiling insulation.   

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Solar Crawl Space Vent Fans

Solar Crawl Space Foundation Vent Fans

CSF Solar Crawl Space Fans exhaust crawl space moisture and odors, using existing foundation vents. Bad air is gently and evenly pulled out of the crawl space through a foundation vent and replaced by fresh air entering through the other foundation vents.  


  • No expensive or complex encapsulation, de-humidification systems, or condensation water pumps. 
  • No duct work to install. 
  • No need for an AC electrical power circuit. 
  • No need for humidistats, thermostats, or other unreliable and costly controls. 
  • No need to go into the crawl space for installation.  

Be Careful! 

We deliberately make CSF fans as exhaust fans so that there is no chance to push “bad” air from the crawlspace into the living areas above. We also deliberately make them smaller, lower power fans so that there is no chance of pulling air out of the living area, which could also dangerously back draft furnaces, fired water heaters, kitchen vents, bathroom vents, and other exhaust ducts. If more airflow is needed, please contact us at info@spsfans.com about a specific custom CSF arrangement for the specific building. We make custom synchronized push-pull (supply-exhaust) balanced cross-flow solar crawl space fans for larger spaces.

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Custom Solar Vent Fans

Custom Solar Fans

Custom solar powered fan solutions are a significant part of our business. Some past examples include - 

  • Solar vent fans for over-the-road hay drying and storage trailers.
  • Solar vent fans for firewood drying.
  • Solar storage shed fans.
  • Solar garage fans.
  • Solar trailer fans.
  • Off-grid crawl space fans for cabins, camps, and boat houses.
  • Push-pull cross flow under floor crawl space ventilation.
  • Push-pull ventilation of finished attics with knee walls.
  • Remote solar panels due to heavy nearby shade (up to 120 feet apart).
  • Paired attic and crawl space fans on the same 30 watt solar panel.
  • Enclosed cathedral ceiling solar ventilation.
  • 10, 20, and 30 watt solar panel systems
  • Solar bilco drying fans

Solar under deck drying fans

Use the contact form on the "About" page to discuss your project with us!