generator exhaust vents

airing atmosphere ceiling channel chemical chimney conduit conveyer cooler duct ecology efficient energy environment environmental equipment exertion exhaust factory fans flames flow force freshening fuel fume fumes funnel gas global hood hose hot ice iced icedover icicle icicles icy industrial industry intake light main manufacturing morning over oxygenating passage pipe pipeline pipes plant pollution power production purifying refinery smoke spout steam steamy steel system technology trough tube vent ventilation vessel warm warming winterair