Just to correct the operation of a Vent-Away. It only ventilated when the handle was pulled out or flipped up, depending on the model. It then ventilated forever or until the toilet was flushed the normal way and/or the handle was returned to the center position. Since few people ever read the manual and did not know what the handle markings meant, the ventilation feature was seldom used, but the user was satisfied thinking that their expensive, complicated toilet was keeping them odor free. And since it drew the air through the rim holes it worked better if the lid was up.