VENTILATOR FOR DUCT

摘要

PROBLEM TO BE SOLVED: To solve the problem raised by the conventional ventilator that its manufacturing cost is not able to be held down and its product is not able to be put on the market at a low price due to the large number of parts used in its grill. SOLUTION: A ventilator for duct is constituted in such a way that a blower is provided in the main body of the ventilator having an opening in its bottom face and a bell mouth having a round hole and a long hole for engaging a spring at its central part is positioned below the blower. The grill provided with a projecting section for catching the spring on the bell mouth side is made freely attachable and detachable to and from the bell mouth by using the spring engaged with the long hole and the projecting section is integrally formed with the grill.