Concentric DuctHorizontal Discharge (C13)
Twin Duct (C53)- Vertical Discharge
Twin Duct (C53)- Horizontal Discharge
Conventional Open Flue(B23) - Vertical
Conventional Open Flue(B23) - Horizontal
2 boiler - above
2 boiler - below
3 boiler - above
3 boiler - below
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