Offset Block

Offset Block

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Offset Blocks

When design parameters do not allow for a vertical chimney installation, Offset Blocks offer the ability to move the chimney to the side, allowing it to pass objects, such as another fireplace, positioned above the firebox.

A non-combustible column under every fifth block must support the Offset Blocks in a series. Offset blocks are stacked in series with each one providing a maximum offset 2 5/8″. Offset direction may be left, right, back, or in a spiral pattern for “twisting” flues.



  • Dimensions: 22"(W) x 24.5"(L) x 4" (H)
  • Weight: 60 lbx
  • Vertical Offset: 4"
  • Horizontal Offset: 2 5/8"
  • Maximum Horizontal Distance (or max offset): 40"
  • 1" clearance to combustibles
  • Offset angle: 30°


Important: Please consult local building codes for specifics regarding all masonry fireplace applications.