High Quality Stainless Steel:Made of high-quality stainless steel, advanced unicase stamping technology, strong in durability, non-deformable, anti-rust and corrosion-resistant, anti-fracture, anti-sunsmooth and polished surface. 45 Degree Louver Design:The interior of the stainless steel ventilation cover is designed with 45-degree louver. The outer ventilation cover is hemispherical to block wind and rain, while the louver is designed to prevent rainwater from leaking into the pipe. Precise filter to Protect Your Room:The bottom of the ventilation cover also has a thick layer of precision mesh that effectively prevents insects, rats and birds from entering your home through the pipeline. Effectively solve the problem caused by the large mouth of the family. Buckle Barb Installation:The bottom is a snap-on design that is easy to install. The installation work can be done by directly inserting the part with the buckle at the bottom into the pipe. Pay attention to the edge of the ventilation cover when installing, please wear gloves. Suitable for Pipes:This ventilation cover is suitable for all 3.7"-4" diameter pipes, such as air conditioning units, kitchen fans and vents, tumble dryer exhaust pipes/hose, bathroom vents and suctions, all household wall exhaust Holes, as well as a variety of industrial applications.