Osburn OB04002 - Manual (Page 93)

Stratford Fireplace Installation and Operation Manual
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5. Align the notch in the left
end of the tube with the tab
of the left air channel hole.
6. Insert a cotter pin in the last
hole on the right side of the
tube. Then bend the tabs on
the pin to keep in place.
7. Repeat steps 4, 5 and 6 for
the two tubes in the back
then install the baffle. Then,
install the two front tubes.
8. To remove the tubes use the
above steps in reverse order.
Note that secondary air tubes can be replaced without removing the baffle board.