| 摘要 |
<p>Fiberglass reinforced plastic fume exhaust systems include duct walls (12) having apertures (27, 29) therein covered with meltable thermoplastic resins mounted thereon which melt and open up the apertures when exposed to high temperatures thereby admitting ambient air therein to reduce the temperature downstream of the systems and reduce the suction pressure at source of the high temperatures.</p> |
