What does a roof vent look like?
Short answer. It depends on the type: a ridge vent is a low, slightly raised strip under the cap shingles along the peak; box vents are square hoods near the top of the roof; turbines are round spinning domes; power fans are low round domes; and bath or kitchen exhaust caps are small hoods with a flap. Pipes sticking up through a rubber boot are plumbing vents, not attic vents.
Attic vents
- Ridge vent: the peak looks a little thicker than plain ridge cap, an inch or two high, often running most of the ridge. Many owners never notice theirs.
- Box or static vents: squares roughly a foot to a foot and a half across, slanted back, usually in a row a few feet below the ridge and colored to blend with the shingles.
- Turbine vents: round metal heads with curved fins that spin in the wind, mounted on a short cylinder.
- Power attic fans: low round domes, bigger than box vents, usually one per roof slope, sometimes with a small solar panel on or beside them.
- Gable vents: louvered openings in the end walls under the peak.
- Soffit vents: under the overhang, not on the roof surface at all.
Things that look like vents but are not attic vents
- Plumbing vents: plastic or cast iron pipes, 1 1/2 to 4 inches, sticking up a few inches through a flashing boot.
- Appliance flues: metal pipes with a cap and storm collar for gas furnaces and water heaters, or paired PVC pipes for high efficiency units.
- Exhaust caps: small hooded vents with a flap, one per bath fan or range hood, each connected to a duct.
- Chimneys and skylights: obvious, but each needs its own flashing.
Why it helps to know
Knowing which is which makes problems easier to spot from the yard: a box vent missing its hood, a cracked pipe boot, or an exhaust cap whose flap has fallen off. Binoculars on a sunny day work well. See ridge vent vs box vents and roof anatomy explained.