Air Vent does not recommend the Hip Vent with plank style decking. Once the planks are cut, there is no horizontal support on the hip ridge, so it will flex and weaken terribly. Any attempts at supporting it will likely block the area of the slot for air to flow, rendering the vent ineffective from that standpoint. Perhaps for this home a power fan would most likely be a better option as the decking can be supported between the joists where the hole is cut to ensure the cut planks can support weight.