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Heatilator • GBST4336I, GBFL4136I • 2135-900 Rev. D • 11/08
TOP VIEW
3-1/4 in. Min.
2-3/4
in. Min.
1/2 in.
Min.
Unlimited
1 in.
Max.
FIREPLACE
OPENING
Figure 5.8 Clearances to Combustible Mantel Legs or Wall
Projections (Acceptable on both sides of opening.)
Note: Clearance from
opening to perpendicular
wall.
Combustible Mantel Legs or Wall Projections
Figure 5.9 Non-Combustible Zone
SHEETROCK
AIR SPACE REQUIRED
3-1/4 in.