Ridge vents are another form of passive roof vent that you can use for your attic ventilation. These vents are installed along the peak of the roof line of your home. As the air gets warmer in your attic, it gradually rises and pulls fresh, cooler air from the soffit vents.
This allows the hot air to escape through the ridge vents, decreasing the overall temperature of your attic. Ridge vents are preferred by some people because they can vent out air more efficiently, since they are placed along the highest part of your roof and they allow the air to travel upwards.
With ridge vents, the air in the attic does not need a roof vent to escape, since the air will naturally move upward and out along the roof peak. Both ridge and soffit venting provide a natural and efficient air-flow system to ventilate your attic. They work best when installed on steep slope roofs, so that the vents can utilize the airflow. When they are installed on low-sloping roofs, the air tends not to evacuate the vents as efficiently.
A roof turbine is a large round exhaust fan that sits on top of your roof to help ventilate your attic and home. Many rooftops usually require at least one of these for adequate ventilation. As with the ridge vents, roof turbines are another type of passive air ventilation system which requires only the wind to turn the fan and remove air from the attic.
Roof turbines can expel a high volume of air very quickly as long as they are provided with plenty of wind. A small turbine vent that is 12 inches in diameter with a constant wind speed of at least 5 miles per hour can remove approximately 347 cubic feet of air from an attic every minute. As the wind speed increases, you will notice even better results.
However, there is one drawback to using these turbine vents, which is, that air flow can become restricted when the winds quiet down as compared to other types of passive roof vents. This is because there is less area for the air to pass through. If you have only one or two of the turbines on your roof, the air may get backed up when it has to funnel through a smaller space instead of using a few low profile vents or ridge vents. Another drawback is that, for some people, the turbine exhaust fan can appear rather unsightly, since they are very large.
Power vents use electricity or solar energy to ventilate your home and attic. As such, they are considered to be an active ventilation system. Power vents work by powering a fan to draw air out of the attic. This can be a more effective way to ventilate an attic, especially when there is little wind available. Solar power vents are good for energy savings as they cost little to nothing to operate. These roof vents can help you save money on your air conditioning bills by forcing out hot air in the attic during the summer months, resulting in less energy being required to cool your home down.