Surf these sites: Bayliss Autovents -- Specialist vents which open and close automatically using energy from the warmth of the sun or the surrounding air. The hotter it gets, the wider it opens the vent. Industrial Louvers -- Louvers, vents, equipment screens, decorative grilles, column covers, and beam wraps to fit any design or construction requirement. Louvers & Dampers, Inc. -- Manufacturing a variety of high quality products for the control of air movement since 1961. The product line also includes penthouses, ventilating hoods and roof curbs. Vent Products Co. -- Dampers, louvers, and vents for HVAC systems. Chicago, Illinois
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