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Some fanassisted noncondensing furnaces and

Some fan-assisted, non-condensing furnaces and boilers, installed between 1987 and 1993, may be vented horizontally through high-temperature plastic vent pipe (not pvc pipe, which is safely used in condensing furnaces) this type of venting has been recalled and should be replaced by stainless steel vent pipe if horizontal venting was used, an additional draft-inducing fan may be needed near the vent outlet to create adequate draft floor furnaces.

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