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Gas heat puzzle

Across
Senses the standing pilot
Turns on fan by temp or timing
27.7 inches of water column
Deadly poisonous gas
False load on the tstat for cooling
Must be sensed to turn the gas valve on
When your CO2 and CO readings are bad
Provides the spark to turn the pilot on
No longer used to enable heating or cooling
When this blows out, the heat doesn't run
Set to match the heating system current draw
Fuel, air spark = this
Down
Temperature sensing switch
Type of system that has forced hot air and heats with gas
One of the By products of combustion
Valve used to start and stop a gas furnace
No pilot required to light
Safety device that shuts unit off when the fan fails to start
Burner tube that runs across a set of burners
Filters the air
What goes up the chimney