Extending a cold air return


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Old 11-08-06, 05:40 AM
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Extending a cold air return

We finished demolition in the main room of our basement in anticipation of splitting it into two bedrooms and a hallway. Right now the only cold air return for our forced air furnace on the basement level will be in the hall.

The extisting cold air return line is an "L". The base of the L has a vent for the basement, the end of the short leg of the L is the vent for the main level.

Although we have a forced air gas furnace, we will be mainly heating with a cast iron wood stove on the main level and running the fan on the furnace to distribute heat to the basement as needed.

1. Should we expand the cold air return so that there is one in each bedroom? Each bedroom will have windows/doors so they will inherently be colder than the hallway.

2. Can you simply extend the existing cold air return so that it runs into each room, thus having all cold air returns for the house on one return line (one set of ducting, four holes), or would this decrease efficiency in the returns further away from the furnace?

3. If we can simply extend the cold air return line, would it be advisable to put in a cold air return next to the warm wood stove as well (I have heard this will make the heat distribution most effective). This would create five cold air returns for the house - two in the great room upsatirs, one in each bedroom, and one in the downstairs hallway.

Thanks!
 
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Old 11-09-06, 09:21 PM
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Wink

Ill go with #3. But you could set the 2 doors in the basement higher are cut them off to clear the floor or rug be 2".
 
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Old 11-10-06, 05:10 AM
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Ed do you mean allow for some extra space under the bedroom doors so that air circulates under the door? Probably not an option, at least for the master BR, because we are soundproofing and my audio engineer hubby will want that solid core door to come all the way to the floor....

The numbers aren't intended to be options, just three phases of the same question ;-)
 
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Old 11-10-06, 12:37 PM
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If the room is going to be tight for sure you need a cold air return out of it
 
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Old 11-11-06, 07:28 AM
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So extending the existing cold air return duct should be okay?
 
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Old 11-11-06, 01:01 PM
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Yes : Think about it if you close the room up tight. When the furnace blower comes on it can only blow so much warm air into the room. Then if the air cant get out it cant change the cold air to warm air in that room.
 
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Old 11-11-06, 01:27 PM
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Thanks! Luckilly the change is easy to make
 
 

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