contained

breeching

outlet

air

draft

fluid

shape

around

finned

furnace

regulates

closes

flaps

through

unfired

accumulate

piping

vanes

fire

out

control

flames

fuel

flows

deposits

connects

escaping

lights

pressure

pulls

inlet

shield

built

soot

spots

tile

pattern

swirls

flowing

escape

heating

heat

radiant

stack

spreads

collects

burnt

lit

material

designed

cells

touches

atmosphere

outside

flue gas

fires

dry

refractory

firings

tubes

gases

moisture

venting

pilot

lost

upward

/pos