Features: Adjustable Wall Mounted Ventilation Vent with Insect Proof meshing for smooth 185 to 335mm Wall Adaptability and Bidirectional airflows . Engineered with telescoping PVC metal construction and integrated rain guards, featuring auto adhesive sealing strips to eliminate draft while maintaining whispers quiet operation. designs for homeowner search permanent ventilation solution in humid kitchens, basements, or dust inclined living areas requiring continuous air refreshment. Optimizes indoor air circulation in residential space through its double action airflows system and washable not dust filter, effectively reducing condensation and odors. Combines weather resistant design with high density meshing barriers to prevent 98% of particles and rainwater , ensuring maintenance without performances. Specifications: Material: plastic+metal Length: about 340mm/13.39inch Width: about 140mm/5.5inch Package Includes: 1 set Ventilation System note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.