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Old 12-15-2009, 04:04 PM   #1
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Hello experts,

I'm remodeling my basement and need help determining if I should ADD a register and ADD a return. See the attached pic. I'm thinking about running the 6" tube into the "false" soffit and split it at a tee and have the registers reside in the soffit.

I also have the return air from the 2nd flr of the house coming into this room. Should I bust into this return and provide return from the basement?

Thanks for the help,
Brandon
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Old 12-15-2009, 04:45 PM   #2
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A 6" supply isn't big enough to carry the volume of air needed for 2 registers. If you increase it to 8" all the way back to the trunk it might work. I wouldn't ruine an upstairs return like that or put a basement return in a ceiling. Any way to tap the return drop and go through a wall?

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Old 12-15-2009, 06:07 PM   #3
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Originally Posted by Marty S. View Post
A 6" supply isn't big enough to carry the volume of air needed for 2 registers. If you increase it to 8" all the way back to the trunk it might work. I wouldn't ruine an upstairs return like that or put a basement return in a ceiling. Any way to tap the return drop and go through a wall?
Yeah, unfortunately there's no way to get the return into the wall. I figured it wasn't a good idea to have the return in the ceiling, but wanted to confirm. What if I put two 2x10 registers, would the 6" still be enough?
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Old 12-15-2009, 06:12 PM   #4
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Nope.
You won't get the air to throw down to the floor.

Either use an 8" as suggested. Or 2 separate 6" supply runs. If you want it to actually be some what warm in the basement.
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Old 12-15-2009, 09:03 PM   #5
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Originally Posted by beenthere View Post
You won't get the air to throw down to the floor.
You want >600 FPM for this?
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Old 12-16-2009, 06:27 AM   #6
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Need to choose the correct register.

A H&C 682M 2 way at 70CFM and 600FPM only has a throw of 6 foot.
But the 681M 1 way 70CFm and 500FPM has a throw of 8 foot.

He would probably be better off using H&C A618 10X4. That would give him the ability to throw 100CFM 9.5 foot at 500 FPM. Making it fairly quite.
And it still has a throw of 6 foot at 60 CFM at 300FPM.
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Old 12-17-2009, 09:57 AM   #7
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http://books.google.com/books?id=J_R...row%22&f=false

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