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42" Outdoor Engineered Masonry Fireplace System
Item#: 46000033

Give your outdoor room the clean finish it deserves with the 42" Outdoor Engineered Masonry Fireplace System. Interlocking modular concrete pieces join together to create a masonry firebox that is stronger, lighter, and 50% cheaper than a customary stonework installation.


  • Angled fireplace backing provides better heat reflection
  • Withstands more than 3,000 PSI
  • 100 year life expectancy
  • UL Standard 127 compliant
  • Fireplace has been third party verified for in-home safety

This kit brings the stonework tradition to new heights of durability, now able to withstand more than 3,000 lbs. per square inch. From foundation to framing, this unit has been designed for efficiency with an angled backing for better heat reflection. In addition, an easy one-piece masonry flue system keeps construction easy—simply stack one block on top of another, then mortar them together. The entire firebox can be completed in a matter of hours, as opposed to a 2-3 week project that will incur hefty installation costs. Several reports have been issued to prove the durability of this unit, including an ICC-ES Report and a Los Angeles Research Report. Finally, by adhering to Underwriters Laboratories Standard 127 and backing up the product with a 20 year warranty, we go the extra mile to guarantee your fireplace for a 100 year life expectancy.

10 bags of FireRock Mortar are needed for proper installation. For every six blocks of chimney, an extra bag of mortar is required. Up to 12-15' of chimney can be supported with this fireplace kit.


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