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If you mean the appliance has a 4 in. vent and you are trying to go to a 6 in. vent then yes you can but is it safe? It can be but you need to be sure. If the flue gas cools to much in the larger pipe then, first the water vapor (which is acidic) will condensate, then if the gas cools enough it will fall back down the pipe which will fill your house with poison gas (carbon monoxide). The other way, going from a 6 in. appliance vent to a 4 in. flue pipe is illegal because of the back pressure. Again this is a sure fire way to kill your family.

Read all you can and talk to people that make vent pipe. Just do an internet search for "type b" vent pipe.

Another thing, buy a carbon monoxide monitor. The cost is less then $50 for a good one and it could very well save your families life.

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Q: How can you reduce type B vent from 6 in to 4 in?
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