Combining ducts or Not


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Old 08-05-12, 08:25 AM
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Combining ducts or Not

If limited space on plenum and wanting to give each area a supply vent, whats your thought on combining supply ducts to say 2 adjacent areas like: Kitchen and Breakfast? (This open area, about 204 square feet, currently has only 1 supply vent.)

Provide a single supply duct of 8 inches, providing about 230 CFM for the total area. Knowing that this could be noisy, split into 2 supply vents, 1 over each window in each area, fed by individual 6" ducts from the 8". In theory giving each area 50% of the volume delivered by the 8".

or if supply plenum space allows

Would you rather run individual supply lines to each: Kitchen (104 sq feet) 7" providing 160 CFM (allowing for appliance heat gain) and Breakfast area 100 sq feet getting 6" 110 CFM.


Thoughts?
 
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Old 08-06-12, 07:24 PM
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Always go with separate lines.
 
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Old 08-06-12, 07:32 PM
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Thanks for the response, appreciate it
 
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Old 08-11-12, 05:57 AM
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If your plenum space is limited, your proposal is a sound one. I have used that application many times with good success. Try to keep the 6" runs as equal in length as possible and build a triangular distribution box at the 8" duct end to attach the two 6" runs to.
 
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Old 08-11-12, 06:42 AM
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Thanks for the additional advice.
 
 

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