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Old 09-15-2009, 10:41 AM   #16
 
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Aggie thanks for the advice! Just enough of a cut for a cold air return so no more than 10-12 in length and 3 inches of the 3 1/2 in 2 x4 on the bottom. So it would be a cut out of this bottom 2x4 of that size. Does that change anything since I am not cutting it completely out?
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Old 09-15-2009, 10:54 AM   #17
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That sounds like you're only leaving 1/2" of material behind after the cut. To an engineer, that 1/2" doesn't even exist.

Call the truss maker. They'll be in the best position to help you out. I've dealt with a bunch of them in my practice, and they have engineers on staff to support their products and field mods. The manufacturer's stamp will be on the top and bottom cords. It also looks like a new structure, so the plans will more than likely be on file somewhere down at the building department.
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Old 09-15-2009, 11:08 AM   #18
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I agree with aggie, I would not cut the engineered truss at all. They are engineered with some parts of the truss in suspension and some parts in tension, therefore: if you cut anything you change the way the truss was engineered. After seeing the picture I would recommend having a sheet metal shop design, and fabricate for you a "transition" piece which would go between one of the trangular shaped areas. Whether you are currently using square, rectangular, or round duct, this transition piece can be made to fit either one, and you can continue your run. Good Luck, David
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Old 09-15-2009, 11:15 AM   #19
 
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Thanks for your help Thurman! The problem is that the current basement wall sits directly below the bottom of the truss and in order to run a retrun down the wall to the basement floor is to go through the truss. The option that I have is to frame a box off the wall that sits on the truss and put the return in there. I don't want to have to do that since it will look awful.
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Old 09-15-2009, 11:47 AM   #20
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I don't know you're particular home, but I am certain it won't look awful. This is done all the time. My house has a couple of chases and they are what they are. Most of all, I'd rather have a stable and secure home with an HVAC chase than a perfectly run duct in a house where the stability and structure has been sacrificed.
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Old 09-15-2009, 06:08 PM   #21
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You can not count on the wall to support the truss even if that is an option. The wall is sitting on the slab not on a foundation. Box it out from the wall or make it a 45. You might be able to hide it with an architectural feature like a bulk head for lighting... Be creative.
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