Soffit exhaust vents Ideal for exhausting bathroom and kitchen fans. Features include a frost free damper system, flush mount design and leak proof collar to duct connection to prevent moist air backdraft. Front facing can also be painted to match your soffit color. Fits 4 inches, 5 inches and 6 inches ducts and has an outer grill and air pressure activated flap with stainless steel spring to help prevent pests from entering.