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The is an 'Air hole' at the bottom of the burner. This air hole has a slip collar , which can be twisted/turned/rotated in order to control the air flow.

When the collar is turned such that the air hole is closed, then you have a 'slack' yellow flame.

When the air hole is fully open , you have a 'roaring' pale blue flame.

The temparture is controlled by the air hole too!!! . With the yellow flame is at its coolest, and with pale blue flame is at its hottest. However, you need a special heat resistant thermometer to insert in to the flame to read the actual temperature.

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lenpollock

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2y ago

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