Single EM40

Our 16” Diameter EM40 Universal Flue is the largest insulating masonry chimney available. With proprietary “Air-Vent” technology, it will not crack like cheaper concrete alternatives. Used exclusively for outdoor applications. It requires a 2” clearance to combustible materials.

Modular refractory masonry precast chimney components. Designed for field assembly as a outdoor chimney unit.


Light weight concrete of a proprietary mixture of Icelandic volcanic aggregate and aluminum cement for precast chimney block components.
Compressive Strength: Chimney Block: 972 psi.
Tensile strength: 807 psi; Compressive strength: 2460 psi.
Tested per ASTM C109, ASTM C307, and ANSI 118.4.