1PC Plastic Air Vent Grille Cover with Net,3 Flaps Louvered Vent Cover Wall Duct Ventilation Grill for Wall Ceiling Bathroom Kitchen Cooker Hood Fans(20 * 20cm)

• AUTOMATION : When the dryer is not on, it closes the vents and pushes hot air through them. On cold days, it helps prevent drafts through the vent or dryer. It can easily open the flaps when any pressure is applied from the inside.
• MULTI-PURPOSE : Gravity grill covers can be used as part of a long duct system for multiple uses: Whole House Ventilation, Air Conditioning Ducts, Passive Ventilation, Positive Input, HVAC, Heat Recovery Systems and Covering Bathroom, Kitchen Air Conditioning Fans.
• ANTI-ODOR : The one-way shutter automatically closes when not in use. Blocks unpleasant odors, noise or airflow back through the ducts. Gravity flaps, so no springs that could break for support.
• APPLICATION : It can keep indoor and outdoor air circulation. Suitable for covering ceiling openings and duct vents. Also the decoration of supply and exhaust vents for public, residential and industrial ventilation systems.
• HIGH-QUALITY PLASTIC : The air outlet is made of high-quality durable plastic. Not easy to deform or break, easy to clean. You can safely use it for a long time. Surfaces can be painted to match the home's exterior and siding to further extend their life.

Specification: Material: Plastic Color: White Hole Inner Diameter: Approx. 5.14 mm Hole Outer Diameter: Approx. 9.44 mm Type(L x W): Approx. 15 x 15 cm / 5.91 x 5.91 inch 20 x 20 cm / 7.87 x 7.87 inch(Optional) Weight: Approx. 130g(15 x 15 cm) / 255g(20 x 20 cm) Package Included: 1 x Ventilation Grill