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Direct vent boiler, intake and exaust

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This picture is the top of a high efficiency direct vent boiler, used for radiant heat and a hot water tank. Why are there tees and reductions on both the exhaust and intake? I have never seen this and can't figure out what is going on here.

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Perhaps the answer lies in the manufacturer installation instructions for that boiler.

This is the first I've ever heard of such changes in vent sizes.

Would you have the Make and Model for that boiler?


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It is a Triangle Tube Prestige 250. The install manual doesn't say anything about allowing either exhaust or intake to be split like that. Plus this is a 4" teed into two 2" pipes. The cross section area of 4" is about double that of the area of two 2" pipes. There is no way this is right.

Here is the leaking exhaust

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