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The Daily Insight

What is a gable vent louver?

Author

Ava Richardson

Updated on April 29, 2026

What is a gable vent louver?

You can spot a gable roof when you see a house with one long ridge spanning the roof. The gable vent is placed at both ends of the roof, on the sidewalls of a house beneath the roof eaves. Also, known as louvered vents, you might’ve seen them as big triangles or circles on the exterior house walls, near the roof.

What is the louver vent for?

A louver is a ventilation product that allows air to pass through it while keeping out unwanted elements such as water, dirt, and debris.

Should I block my gable vents?

There is no need to block the gable vents unless they are prone to collecting windblown rain and snow. (This would not be related to adding the ridge vent; that would have already been true before the roof work.)

Are gable vents bad?

Many roofing contractors discourage using a gable vent with ridge vent and soffit vents because a gable vent interrupts the proper airflow and can cause the air current to flow perpendicular and unevenly throughout the attic. Be sure to keep them clean for proper air flow.

Are gable vents intake or exhaust?

Gable vents are installed in the gabled ends at opposite ends of the attic. When prevailing winds blow perpendicular to the vents, the gable vents act as both intake and exhaust. Less air exchange takes place and attic ventilation is not uniform, so it’s less effective.

Should gable vents be closed in winter?

You should absolutely leave your roof vents open during the winter – do not cover them! During the winter, roof ventilation works to keep temperatures even. Closing your vents makes the attic space too warm and dry – dangerous conditions for mold as well as pests.

What is the difference between a louver and a vent?

Heat registers are vent covers that cover the hole in the wall or floor where the duct enters the room. Louvres, or dampers, are often attached to the back of a heat register. These adjustable louvers/dampers can open or close the register to open and close the flow of air.

Can rain get into roof vents?

But some roof air vents sit fairly flat to the roof, with a mushroom style hood and unprotected sides. And on occasion a hard driving rain with whipping wind will cause roof vents to leak water. If your roof vent leaks during heavy rain, the rain may be blowing up under the hood and into the vent.

Are gable vents a good idea?

Though gable vents are nice to look at and serve the same function as other ventilation systems (keeping out the rain, preventing leakage, avoiding deterioration of materials in attic, lowering utility costs), they may not be able to do it alone.

What is the best way to vent an attic?

For the best results, place roof ventilation near the roof’s peak and soffit vents in the eaves. Air flows in through the soffit vents and out through the roof vents. Vents come in various styles. We chose rectangular, hooded roofing vents and rectangular soffit vents because they’re easy to install.