Osburn OB04010K Installation And Operation Manual page 36

6.3.5.1 Option #1 - Installation directly on the floor
• A 2.00 R value for the hearth extension is required. The non-combustible hearth extension floor area
must extend at least 32" (813 mm) (B) in front of the hearth.
• The joint between the hearth extension and the fireplace (E), for the entire width of the floor
protection, must be protected by a bent and continuous piece of sheet metal (not included).
• An 84" clearance between the fireplace base and the ceiling (A) must be respected.
A
B
E
The floor under the fireplace should match or exceed the height of the floor protection.
36
MINIMUM MEASUREMENTS
84" (2134 mm)
32" (813mm)
2" (51 mm)
NOTE
HORIZON – Installation and Operation Manual