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Ridge vent system attic.
A ridge vent runs the entire length of the roof peak blending into the roofline for a more attractive home.
Roof ridge vents do work well when there are soffit vents or box vents that help to draw air into the attic.
Fans are needed only when there isn.
In a properly designed passive system air enters through the soffit vents rises by convection in the attic and exits through the vents in the roof or gables.
Years of research prove that a ridge vent with external baffles and an internal weather filter combined with undereave venting is the most efficient system you can install.
That means you have a lower risk of mold or mildew development.
I noticed you said that these two systems should not be combined.
Find out which type of roof ventilation system works best for your home read our guide owens corning ventsure sky runner lte 14 5 in.
Rolled ridge vent in black.
Gaf cobra snow country 13 7 in x 48 in black plastic stick roof ridge vent.
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You will also discover that this product can work by itself to release moisture from the house which is especially useful during the winter months.