Plenum to supply trunk

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  #1  
Old 09-30-18, 10:26 AM
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Plenum to supply trunk

Im changing my furnace out with a70,000 btu with a/c. My issue is, the coil and plenum is 17 1/2 21 3/4 and the supply trunk is 18 x 8 which is 20' long with 8-6" runs off that. Do i put a 16x8 takeoff on the plenum and fit it to the 18x8 trunk? Looking for suggestions!
 
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Old 10-01-18, 12:59 PM
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two ton AC? Plenum needs to be the size of the opening on the coil
 
  #3  
Old 10-01-18, 07:41 PM
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Its 2.5 ton. I have a 16x8 start collar that i'll match up to the 18x8 duct. Do a little fab work! Thanks for the info!
 
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