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American Aldes 4" Galvanized Steel Roof Cap Construction: American ALDES Ventilation's low profi le, low pressure drop roof caps include integral back draft/weather dampers, bird screening, no-leak roof fl ashing, and extended duct collars for simple installation. Available in heavy gauge G90 galvanized steel, 314 2B fi nish stainless steel or solid copper type Ca 110. Installing the Roof Caps: All caps are designed for installation on any roof pitch or shingling.
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