304 Stainless Steel Material: Made of high quality 304 stainless steel material, the wall ventilation grille provides better performance and longer service life. Application: The grille is ideal for various applications, including dryer/pipe vents, bathroom vents, exhaust fans, air conditioning units, kitchen fans, wall vents, heat transfer and ventilation systems, gas and electric dryers, extractor fans, and industrial uses. Good Design: The wall ventilation grille is perfect for outdoor use, designed with a bell shape and downward-facing blades to prevent rainwater or wind from entering the ventilation system. Strong Toughness, Not Easy to Deform: With its strong toughness, the tips can be reversed to provide a secure grip on the pipe, which makes installation easier and prevents deformation. The grille can also effectively isolate debris and dust to prevent pests from blocking the channel. Note: The data are all manually measured, please allow an error of 1-3 cm. Due to differences