An attic fan is a ventilation appliance which regulates a building’s attic heat level. The fan is typically used to exhaust hot air in warmer months when attic temperatures can exceed 120 °F. Sometimes attic fans are used with a manual on/off switch, but usually, they are automatically controlled by the thermostat. Fresh air draws through additional vents. Solar attic fan systems wire a specialized fan to a solar panel (solar attic fan).
High attic temperatures can raise utility bills, reduce comfort, and shorten the lifetime of roofing materials. After the tar in a roofing shingle goes through many cycles of melting and abuse from the elements, it becomes brittle and begins to crack. Besides, people often collect a lot of stuff in their attic. The attic is often the only place to keep those things. Obviously, the temps in the attic will make that location really undesirable.
In winter cold temperatures coupled with excess humidity from humidifiers, dishwashers, and showers can lead to a weakening of internal structures caused by fungus growth and mold; structural decay and leaks triggered by roof ice buildup; damage to framing materials and insulation produced by moisture accumulation.
You need to check an existing attic ventilation, clogged vents will need to be cleared if your new fan is to work properly. You must have the point where air ENTERS the attic. If your soffits are not perforated to allow air movement, install round air vents under the eaves or replace it with perforated soffit to allow air flow.
The attic fan is made of metal, and if mounted on the roof, it is also a subject to lightning strikes, therefore grounding is extremely important. The grounding is achieved through a mounted on the thermostat box screw. In modern attic fans, a grounding wire connected directly to the motor as well. There is also some controversy about the effectiveness. In some cases, the negative pressure in the attic can cause conditioned air from living spaces to be pulled into the attic, can negating the energy conservation gains (Old-House Journal).
Solar Attic Fan Review
Investing in a solar attic fan may reduce electricity bill by reducing conditioning system workload, prevents moisture buildup and mold in your attic, and increases your roof lifetime. The solar fan is easily installed, it also doesn’t need to be tied into your electrical grid, it does not need additional circuit breakers, and you can install it without a licensed electrician. Solar attic fan doesn’t use extra energy and work virtually silent.
Sunvent can be fixed at any angle and surface. The best possible use – on equator-facing roof or window thickness greater than 1/16 inches, Use a tube with internal diameter 116-120mm of the required length. The fan has an in/out directional switch. Its location is under the blades, stop the sunvent it to switch directions.For qualified photovoltaic equipment, including solar attic fans, are provided many government tax incentives. The customers are eligible to receive the federal tax credit of 30% on the purchase and installation cost, and you can receive even more in localized incentives.
The unit is fully automated and is powered by solar energy, works almost silent. The whole set is water-resistant and you can install near water sources without any worry.
Amtrak Solar Attic Fan comes with a 40W High-Quality Crystalline solar panel. Both are covered by 25 years warranty. You don’t need to make holes in the roof, it can be installed in gable vent. Wiring is easy and quick, no need for electricians. The panels come with mounting brackets and instructions. Wire (15′) with quick connect fitting are included. Built in the USA.
The fan is well built and very easy to install. It comes with 12 volts direct current 35W fan with 11″ blades and 12″ housing. You can change the rotation direction by changing polarity (reverse the wiring connections). I tested the fan by using a car battery and found the fan is capable of moving a LOT more air. Some people purchase a 100 Watt panel, and with it, the fan moves some serious air. But I believe, it is not necessary, the negative pressure in the attic is undesirable.
Power Attic Ventilators
The fan is roof-mounted with a steel flange. The manufacturer has worked in the ventilation industry for over 60 years. Dimensions:Cool Attic CX1600 powered by 115-volt, 4.5-amp motor, you can optionally buy
18.3 x 17.3 x 7.1″, made of galvanized steel.
The fan works mounted at any angle and even upside down. The blades are aggressively pitched for good draft. The metal is a little flimsy. A shroud is very thin and can warp easily when you are handling it during installation, but it is still much more reliable than plastic.
The price is about $50 plus a couple of boxes, switches, and some wire. You can get the wiring diagram on the site. The CX1600 does make noise. A part of it is caused by fan blades cutting air and the other is vibration. It will become quieter if you mount all four brackets on rubber and make sure the fan was not contacting the outer plywood.
Broan 353 Gable MountPowered Attic Ventilator has a 3.4 Amps, 120V thermally protected permanently lubricated motor, 1020 CFM and may be used for up to 1630 square feet of attic space. The blades are 14 inches in diameter and are precision balanced. The only issue is that I wish Broan would add rubber motor mounts to help dampen the vibration.
The steel shroud is made of surprisingly strong metal and it is relatively quiet, much quieter than the ventamatic fan – about 62 db with 27db ambient from about 6 feet away.