VENTILATIVE NOISE SUPPRESSING UNIT FOR VEHICLE

A box type silencer unit 20 includes a ventilation portion 23, a silencer portion 24 adjacent to said ventilation portion 23 and a dividing partition 22 located between said ventilation portion 23 and said silencer portion 24. The ventilation portion 23 is formed of a ventilating passage 23c opened through front end and back end of said box body 21. The silencer portion 24 is formed by closing front end and back end of said box body 21 and includes at least one partition plate to make a plurality of silencing passages 24a and 24b of different length La2 and Lb2. Each of said silencing passages 24a and 24b communicates with said ventilation passage 23c through at least one opening 22a to 22d formed in said dividing partition 22 and at least one 24b of those silencing passages 24a and 24b is provided with at least one passage extending partition 26a and 26b to extend the length of said silencing passage. This device can be applied to such a portion, e.g., the front grille or bumper of an automobile as cannot take a large area in front of the ventilation or a depth in the ventilating direction.