Applicable Scenarios: The 4-inch louvered square vent is suitable for ventilation in areas such as dryers, bathrooms, kitchens, garages, warehouses, and pet rooms. Choose the vent based on the size of your home's ventilation openingBuilt to Last: Made from high-quality 304 stainless steel, it is more damage-resistant and warping-resistant compared to regular hardware or plastic components. The rainproof flap design helps protect the vent from rain and other outdoor elementsProtective Mesh: The vent components are equipped with an internal protective mesh that helps reduce the entry of small animals into the ventilation duct during daily useHigh Compatibility: This vent does not come with a vent hose; please purchase separately if needed. It is compatible with both flexible and rigid ducts. If using a flexible duct, please buy a steel clamp for a secure fitEasy Wall Installation: Suitable for installation on most wall types, including natural stone, brick, wood, or concrete walls. The vent has pre-drilled holes, allowing you to simply mark the position on the wall, drill, and secure with screws