Album Info:
The 3 black ABS pipes are a vent system for a high efficiency furnace and a power vented water heater. The left pipe is the water heater vent. The elbow facing down is the furnace vent and the right hand pipe is the combustion air intake for the furnace. It all looks good and works untill the outdoor temperature falls below 0deg F or -18 deg C when a srange thing happens. The air intake starts to freeze on the inside blocking air flow. See next picture.
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