Osburn OB01601 - Manual (Page 17)

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10. Push the air control (A) in, all the way. Slide the adjustable faceplate sleeve back
into its original location until the faceplate fits tightly against the fireplace facing. See
Figure 10. One 7/16" (11mm) open end wrench should be used to turn the nut (B), located
above the cooktop in the center, up so that it securely fastens the adjustable faceplate
sleeve to the top air jacket. Take the air control slider spring handle (C) from the firebox
and turn it onto the 1/4" diameter (6mm) air control rod (A).
Figure 10