Furnace Venting

Old 05-01-12, 11:07 AM
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Furnace Venting

My current gas fired hot air furnace is rated 75,000 input and 60,000 output
(80% efficient?). It is vented vertically through a double wall stainless steel vent stack and the furnace appears to have a fan on the vent. If I replace the current furnace I would probably want the highest efficiency furnace available. Can I keep the vertical vent or do I need to vent horzontally?
Old 05-01-12, 01:00 PM
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High efficiency furnaces of 90% or higher require PVC venting due to condensing of flue gases in the vent pipe. THey can be run horizontally or vertically. If your water heater is gas and Tee's into the existing furnace vent you will need to keep your old venting.

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