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Re: Multiple vents through one opening
You need to check with the AHJ for the area. They might not require them to go through the roof. Some allow them to terminate in the attic; Some allow them to terminate at a soffit vent; Some allow them to terminate in a vent like the one in your picture. In my area they must terminate outside of the building envelope (out the roof or wall). But, one town down the road allows them to terminate at a vent.
IRC says that they must terminate to the exterior of the home.
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