Osburn OB04010K Installation And Operation Manual page 72

3. 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. 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.
6. Repeat steps 4, 5 and 6 for the two tubes in the back then install the baffle. Then, install the two front
tubes.
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4. Align the notch in the left end of the tube
with the tab of the left air channel hole.
To remove the tubes use the above steps in
reverse order.
Note that secondary air tubes can be replaced
without removing the baffle board.
HORIZON – Installation and Operation Manual