Ortal Clear Tunnel Series Frameless, see-through direct-vent gas fireplace series from Ortal with heat barrier system + 10 sizes. Read More Gas, Ortal, See Through, FramelessRosemary CostelloeOctober 6, 2016ortal, clear series, tunnel, see thru, see through, 2 sided, 2s, frameless, gas, natural gas, direct vent, double glass, cool glass