Words to Describe flues

How flues often is described ("________ flues")

• upper
• longitudinal
• top
• smaller
• perpendicular
• upright
• radial
• lateral
• hot
• necessary
• wooden
• ventilating
• clean
• disused
• inch
• several
• square
• wall
• parallel
• cold
• lower
• balanced
• vertical
• tall
• welded
• tubular
• smoke
• twin
• small
• iron
• corrugated
• warm
• smoky
• interior
• outside
• suitable
• ordinary
• main
• open
• cylindrical
• lined
• internal
• faulty
• underground
• octagonal
• oven
• defective
• fire
• short
• sole
• unlined
• double
• circular
• rectangular
• air
• long
• chimney
• separate
• horizontal
• larger
• bottom
• leaky
• side
• narrow
• adjacent
• vent
• boiler
• round
• inside
• large
• proper
• independent
• inlet
• straight
• special
• individual
• plain
• dark
• heated
• gas
• external
• multiple
• foul