4 Inch Passive Air Vent Thermostatic Auto Wall Mount Stainless Steel 304 Grille
Vent Type Passive Thermostatic Air Vent. 📦Why Choose This Passive Thermostatic Vent?. Electric Fan Design Exhaust Fan. Installation Type Wall Mount. Blade Material Plastic. The vent’s internal core contracts and expands naturally using thermal expansion physics, narrowing or opening the airflow channel based on outside temperatures without requiring any electronic sensors.