Metal vents, typically crafted from aluminum, steel, brass, or iron, are durable, warp-resistant, and recyclable, making them a long-term investment. Their downside lies in the energy-intensive manufacturing process and the added transport emissions from their weight—issues that can be reduced by using recycled or reclaimed metals. Wooden vents, often made from oak, maple, hickory, or bamboo, are renewable, biodegradable, and require less energy to produce. However, they can be prone to moisture damage, and some finishes may release VOCs. Opting for FSC-certified wood with low-VOC sealants offers a sustainable solution without compromising ventilation quality.