Our Keepa Roof Vents remove heat and moisture from the attic with no moving parts, especially for locations that accumulate high levels of snow or rain fall. Can be used as an air intake or exhaust roof vent. These vents have an all aluminum construction, which means it is durable, lightweight, and it WILL NOT RUST. Our Keepa Roof Vents have inner vertical louvers with an 1/8 in. Dia opening, thus maximizing air flow without letting in insects or animals. These are better than insect screens that clog up easily. And unlike your typical whirly-bird turbine vents, our keepa vents are not open to the sky, which prevents rain and snow from entering.