Product Notes

All SPSF Products

Appearance - Solar panel can be mounted anywhere there is sunlight, up to 120 feet from the fans, out of sight. Fans are located inside roof eaves or crawl space vent. No protruding boxes or domes. Solar panel mounts can be painted to match structure.
Fans - Safe, quiet, state of the art 12VDC, high efficiency, UL Listed, brushless motors, polarity protected, with locked rotor protection.  
Safety - Low power, no fire or shock hazard. All electrical components and plastics are UL Listed. Plastics are low smoke, fire retardant, self-extinguishing. Once installed, no exposed moving parts.
Installation Safety - No attic or roof access required for solar panel or attic fan installation. Everything installs at the side of the building with a drill, a screw driver, and a wrench. A ladder is needed for solar panel installation and soffit fan installation.  

Tools Required - Solar panels mount with a drill and an adjustable wrench. Soffit fans mount inside the soffit vent with built-in metal spring mounts, no tools are required other than for opening the vent. Crawl space fans mount with a drill and a screw driver. All electrical connections are plug-and-play and/or wire nuts.   

Weather Tolerance– The roof membrane is not involved, so there are no potential leaks. Solar panels can be mounted to solid roof-edge fascia board/structure, to building structure, or to other solid structure. Solar panels and installation are designed and made for hurricane strength winds, but are easily taken down (2 nuts and bolts) before hurricanes/named storms. Fans are water and dust resistant to IP55 or equivalent, located inside the structure, out of direct weather.    External wires are stranded copper, UV and water resistant.  
Fans are installed/located inside soffit or foundation vent louvers and/or screens where they are protected from blowing precipitation and debris, such as inside the soffit vents, inside the attic eaves, or inside foundation vent louvers/dampers.    

Ventilation Area -  Recommendations are based on our tests and experience with typical attics and crawl spaces that do not have partitions. They are not based on conventional attic fan or crawl space fan CFM recommendations. Results vary somewhat for each application.  

Sunlight Adjustment - Always use the solar panel swivel mount to point the solar panel to the southwest! This will help prevent the fans from coming on in the early morning when the attic air is cooler (soffit fans) or ground condensation is present (crawl space fans), and will prolong the fan run time later in the day.  

Solar Powered Soffit Fans

Concept - House attics trap heat from the sun, hot air, and moisture. The heat and moisture pushes down into the house's living area. The AC runs constantly to try to keep up, and mildew and mold can form where the AC-cooled ceiling meets the hot, moist attic air. The living area seems "musty" and you can feel the ceiling heat.  

Static attic vents, such as soffit vents and ridge vents, help a little by letting some of the hot air out of the attic, but they are often ineffective, and attic temperatures above 140-150 degrees are common.
Conventional attic exhaust fans and wind turbines can pull hot, moist air out of the top of the attic at one or two spots, but cooler, drier air doesn't reach most of the ceiling area in the bottom and center of the attic, where it's needed the most to help the living area.  Any fresh air that enters through soffit vents around the attic edges is drawn upwards along the underside of the roof, never reaching the living area ceiling in the bottom and center of the attic. Unfortunately, conventional attic exhaust fans may also pull air conditioned air through gaps and cracks in the ceiling, causing moist, hot air to enter the house through windows, doors, and floors below. If the attic seems cooler when attic exhaust fans are running, it may be because the AC is being pulled into the attic, costing $$$$!

Solar Powered Soffit Fans take a different approach. Solar Powered Soffit Fans use the sun and the natural process of thermal stratification, which is the layering of rising air, from cool at the bottom to hot at the top, to cool the lower attic and living area ceiling below it. Instead of conventional single exhaust fans near the top of the attic, Solar Powered Soffit Fans use multiple, spaced supply fans to push cool, dry air from under the shaded roof overhangs, into the attic and across the top of the ceiling insulation, then toward the center of the ceiling, creating a cool, dry layer between the ceiling and the hot attic air above it. Less heat and moisture enters the living area, and AC is not pulled up, through the ceiling, by an attic exhaust fan.

Output should be directed from the soffit vent, horizontally across the attic, blowing fresh air in just above the attic ceiling insulation. If insulation baffles are installed, ensure they allow at least the same opening area into the main attic as the fan opening.

Solar Powered Soffit Fans are not a substitute for adequate ceiling insulation, a sealed ceiling, and AC duct and register insulation and sealing.   

Solar Powered Crawl Space Vent Fans

Concept - According to NOAA, the year-round average outdoor air in the U.S. is drier during daylight hours and moister at night. Solar Powered Crawl Space Fans automatically start and run during the day, when the sun powers them and the air is drier. Solar Crawl Space Vent Fans gradually pull the wet and musty air out. Drier, fresher outdoor air enters through the other foundation vents, absorbing moisture and odors, and then is pulled out of the crawl space by the Solar Powered Crawl Space Fan. This cycle repeats itself several times every day, all year, gradually drying and ventilating the crawl space and keeping it dry. The fans automatically shut down at night, or during rain, when the air is wetter.  Insulation values for the floor above improve and the indoor environment improves, too, using free sunlight! Solar Powered Crawl Space Fans are intended as exhaust fans.  Using it as a supply fan risks pushing harmful moisture, gases, and organisms into the area above the crawl space. It should not be used as a supply fan without having a corresponding synchronized exhaust fan. Solar Powered Crawl Space Fans are not intended as crawl space cooling fans. Solar Powered Crawl Space Fans fit standard 16" x 8" foundation vents. If the foundation vents have thermostatic dampers, the fans should be installed inside, on the crawl space side of the vent.  Otherwise, it can be installed from either the inside or outside, or in an opening cut in the crawl space access panel.

Solar Powered Crawl Space Fans are not a substitute for proper drainage or leakage prevention. Pipes and AC ducts that might drip condensate should be insulated, air conditioning vent ducts should be sealed and insulated, and any foundation or piping leaks should be stopped before installing the Solar Powered Crawl Space Fans.

Solar Powered Crawl Space Fans require equal free vent area elsewhere in the crawl space, to allow drier outside air to be pulled in.  If the crawl space has multiple vents, central location of the Solar Powered Crawl Space Fan exhaust fan is recommended for even airflow. Do not use Solar Powered Crawl Space Fans exhaust fans without equal or greater free vent area for outside air entry.

If existing crawl space freeze protection may not be inadequate, abnormally cold conditions are expected, or additional gentle ventilation of the crawl space during freeze conditions are a concern, unplug the fan from the solar panel during at-risk freezing conditions.

From time-to-time, cool ground under the vapor barrier and moist outside air entering the crawl space may cause some very small puddling of water on your plastic vapor barrier.  Experience has shown that Solar Powered Crawl Space Fans will dry these puddles through the exchange of fresh air, resulting in an improvement in the crawl space atmosphere.

Always use the swivel mount to point the solar panel to the southwest. This will help prevent the fans from coming on and pulling in early morning ground moisture and dew before it has evaporated in the sunlight.  

Solar Panel Mounts

Fully adjustable, uses a unique, strong, compact 8” high x 4” x 4” ball and socket that allows the solar panel to be rotated 360 degrees and tilted 320 degrees, providing easy, optimum adjustment for sunlight capture at your location, even seasonal adjustment.  (Think of it as an adjustable satellite dish for solar energy!). 

Roof angle and orientation have little or no effect on the panel location and efficiency. The solar panel can easily be mounted with 4 lag screws or bolts to the roof edge structure, on the side of the structure, on a post, on a fence, on a railing, or on another solid sunlit structure.  No holes in the roof to leak. No racks or poles needed. No reason to go on the roof to install or adjust. No need for complex controls, easy adjustment lets the panel position act as the control. Easy removal and re-installation for names storms in hurricane zones.  Fit most solar panels that are 18” or less in width.  Use with tile and metal roofs without problems.   Locate solar panel out of sight, remote from fans.