Duct opening diameter: 6” Front plate size: 7.24”x7.24” Material: 304 stainless steel Color: silver Features: - Non-return thin louvers that close when fan is not in use to prevent outside air and debris from entering. - Durable, lightweight steel body that is rust-resistant can withstand most weather conditions. - Ideal for venting tumble dryers, bathroom fans, air conditioning units, kitchen fans, electric dryers, or rice cooker hoods. Commonly used in ducts, ventilation fans, circular pipes, and hose fittings. - No professional tools or professional assistance can be installed, only a few minutes to install, easy to open, good ventilation, maximum air displacement.