Fiamma50 20″ modular refractory outdoor fireplace kit. 20″W x 18″H fireplace opening. The Fiamma50 delivers a new level of simplicity for customers looking to install a custom outdoor fireplace. The modular Fiamma kit provides the complete fireplace structure, including the wood storage base, firebox, vent and chimney, eliminating the need for complicated concrete form and block construction. The installer simply stacks four Fiamma pieces and the firebrick floor, and finishes the exterior with stucco and paint, brick or stone.