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UL 1777 Insulated Stainless Steel
Liner or Other Approved Lining System
Follow Manufacturer’s Instructions
on Insulation and Support
For Zero or Other Non-Code Clearances,
Follow Approved Liner Manufacturer’s Specific
Insulation Requirements: Different Clearances
May Require Different Specifications
Masonry Chimney Must
Have Structural Integrity
UL 1777 Insulated Stainless Steel
Liner or Other Approved Lining System
Minimum 8 in. (203mm) Masonry
Thickness in Front of Smoke Chamber
Damper Plate Removed or
Fastened in Open Position
Seal with Non-Combustible Material
Minimum Clearance in Accordance
with Insert Listing
Floor Protection in
Accordance with Insert
Listing
Follow Manufacturer’s
Instructions for Maximum
Liner Extension Above
Chimney
Maximum 30
Degrees
Offset in Chimney
Combustible Floor
Figure 4.3
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