Related Clues:

• Vent for air
• Air vent
• Chimney pipe to draw off smoke
• Vent for smoke, etc
• Smoker on the roof?
• Sooty passage
• Sounds like it's near the coop and passage
• Chimney insert
• Chimney cleaner's concern
• Smoky shaft
• Smoke duct
• Smoky passageway
• Sweeping target
• Outlet for smoke or gas
• Fume vent