Osburn OB04002 - Manual (Page 72)

Stratford Fireplace Installation and Operation Manual
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3. Secure the ducting (A) to the 90° elbows (E) with self-tapping screws (3 per elbow). Insert the
hot air outlets (F) in the elbow (E). Set hot air outlets frames behind the non-combustible
materiel and secure 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.