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Installation and Operation Manual - Osburn 3500
5.3 Door
In order for the wood fire to burn at its best
efficiency, the door must provide a perfect
seal with the firebox. The tightness of the door
seal can be verified by closing and latching
the door on a strip of paper. The test must
be performed all around the door. If the paper
slips out easily anywhere, Either adjust the
door or replace the gasket.
Figure 10: Door gasket seal verification
5.3.1 Door adjustment
In order for your wood fire to burn at its best efficiency, the door must provide a perfect seal
with the firebox. Therefore, the gasket should be inspected periodically making sure to obtain an
air tight fit. Airtightness can be improved with a simple latch mechanism adjustment. To adjust:
1. Remove the lock pin (spring pin) by pulling and turning it Locking pliers (vise grip).
2. Turn the handle counter clock wise one turn to increase pressure.
3. Re-install the lock pin (spring pin) with a small hammer.
Figure 11: Removing the split pin Figure 12: Installing the split pin
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