The series of alloys used is stunning: weathering steel for patina, marine-grade aluminum for weight savings
https://finnxodh573.cavandoragh.org/breathing-easy-for-a-century-custom-made-copper-roof-covering-vents-that-keep-performing
The range of alloys utilized is stunning: weathering steel for patina, marine-grade light weight aluminum for weight financial savings, and duplex stainless for deterioration resistance in rough environments.