This slanted roof vent from Ventilation Maximum is adaptable to roofs with slopes varying between 2:12 to 15:12. The vent has an average evacuation. It can be used to ventilate a regular roof of 700 to 800 square feet. This product is grey and its size is 12" x 12". It is covered by a lifetime warranty against manufacturing defects not connected to improper use of the product.