1) The Aura Ventilator can be installed on steeper pitch roofs ^, up to 90 degrees. A modification is available at no extra charge. The stock version of the AV cannot remain rain resistant above the roof pitch listed above for that model.
2) With equal soffit, gable or other inlet vents, 'Pop Vents' (inlet vents) are available.
3) This chart is based upon the 1/300 rule. One square foot of ventilation on top for every 600 square feet of floor. 50% exhaust, 50% intake.
R*: Available in Round Flange only