Osburn OB04003 Installation And Operation Manual page 83

Stratford Fireplace Installation and Operation Manual
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4. Starting with the rear tube,
lean and insert the right end
of the secondary air tube into
the rear right channel hole.
Then, lift and push the tube
towards the right inside the
hole in the right channel.
5. Align the notch in the left end
of the tube with the tab of the
left air channel hole.