PURPOSE:To reduce the weight of the blow-off port and facilitate the mounting work thereof by a method wherein the blow-off port is provided integrally with an air path having air-tight and flexible properties while such blow-off ports are continuously connected. CONSTITUTION:The base body 1 of the blow-off port is formed by a rectangular flat plate 1a bored with a rectangular long hole 1b at the central part thereof and rise-up rims 1c are provided around the long hole 1b. An HEPA filter (high performance air filter) 2, made by corrugated sheets in order to increase the surface area thereof, is attached to the inner periphery of the rise-up rims 1c so as to cover the long hole 1b. The base body 1 of the blow-off port is provided with air paths 3 so as to envelope the long hole 1b and the rise-up rims 1c along the whole lengths thereof. The air path 3 is formed by a material having air-tight and flexible properties and is inflated upon introducing air thereby forming a horseshoe shape. According to this method, the blow-off port is light and the mounting work thereof may be facilitated since the air path can be mounted in contracted condition.
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