Osburn OB04003 Installation And Operation Manual page 64

Stratford Fireplace Installation and Operation Manual
to the wall with screws. Secure hot air outlets (F) to the elbows (E) with 3 self-tapping screws each.
Secure the hot air outlets grilles to the frames with screws.
4. Maintain at least a 2" (50 mm) clearance between the ducts and the firestop; the required hole size for
the hot air grilles (outlet) is 8¼" × 8¼" (210 mm × 210 mm).
5. The maximum number of elbows in a run of duct is two.
6. Maintain at least 10" (254 mm) clearance from the outlet grille framing to a combustible ceiling, side
wall or mantel.
7. When passing through a combustible wall or floor, a firestop must be installed at the wall or floor
penetration. The hole size must be in accordance with the duct manufacturer's instructions.
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