Capped Tee on HW exhaust duct

Hey folks, ran into this on an inspection today. I believe the Tee previously was used to tie in a conventional furnace. It was later replaced with a high efficiency model that vents through PVC. Is it ok to leave the Tee fitting with a cap?

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Yes.

Was there any evidence that the water heater flue gases were cooling before fully exhausted?

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Looks good from here!

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That’s why they make caps.

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I see that at least once a week, and until I installed a WH with a power vent, I had that same set up in my house.

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Thanks guys for the replies, appreciate that

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