| 摘要 |
<p>PURPOSE:To suppress the deterioration of a flow rate and make the generation of condensate on the outer walls of a main body hard by a method wherein seal between the polygonal main body. provided with a flange, and a panel is ensured to make the leakage of air from the main body hard. CONSTITUTION:A polygonal tubular main body 2 is provided with an opening on the bottom of the same and flange pieces 30, 31, extended outwardly respectively, are formeed on the rim of the opening while a gap 38 between the flange pieces is blockaded by seal materials 32, 33, bonded across respective flange pieces.</p> |
