Product Material: Made of aluminum alloy material with a matte finish, this vent cover is durable and stylish. It can be used on exterior walls, side walls, doors, or cabinets, making it suitable for various applications in kitchens and bathrooms. Size: Outer Size: 550mmx350mm / 21.6"x13.8", Inner Size(Opening Size): 500mmx300mm / 19.69"x11.81", Height: 40mm / 1.57" Double Sided Design: This door louver vent features a double-sided louver design, consisting of louvers and a decorative frame. It is easy to install and remove. 45° Angled Louver: With its 45° angled louver design, this vent allows air to enter your space while preventing water from coming in. It not only enhances aesthetics but also promotes better air flow. Even when the door is closed, this convenient interior vent helps balance air pressure and prevents uneven room temperatures. Note: If the vent cover is intended for a regular door, it can be directly fitted onto the installation opening and secured using glass adhesive. However, if it is to be used on a wooden door, it will require the use of self-tapping screws for installation. Application: Perfect for external walls, side walls, doors, or cabinets, these aluminum louvered door vents are good for a wide range of applications. Whether you need improved air flow in your kitchen or bathroom, these vent covers suit you.