From: Jon Best <jrbest@e...>
Date: Sun Dec 5, 1999 2:01 am
Subject: Re: Odd Room Calculations
> Message: 4
> Date: Thu, 2 Dec 1999 14:48:01 EST
> From: SRF7@a...
> Subject: Re: Re: Odd Room Calculations
> Neat idea, but If you use three 24" wide 6" thick pieces of 703 to make a
> triangle, the hole in the middle aint very big... about 12 sq. inches (3" x
> 4" duct)... If you use 4" it'd be about 40 sq."s which is still too small for
> a return register (5" x 8") for your room... If you skip the interior 703 the
> return might still be too small, even given that it will draw from both sides
> (144 sq."s per side = a 2 sq.' total area)... You could do some light framing
> to increase the width of the base, but seems like a lot of work... why not
> just oversize the flexi-duct in the attic and run it in a big ess curve along
> the way.... that might cure the problem without any special ceiling fixtures.
Yeah, good points. The angles up to the peak are both 30 degrees, and I was
of a wider base- if I used 2" on top, and a 4' piece on the bottom (have to
hanging out, no big deal), that should give me roughly 250ish square inches.
I've got a
really limited attic space, and while I am going to use some piled up flex
duct, I figured a
bigger, absorptive passage would finish off the quieting job.
> Maybe just oversize the flexi-duct and run in an ess in the attic instead...
> though I was thinking of running flexi-duct down one corner (covered by a 703
> panel) so I could blow cold air on the back of my rack and PC.
That's a good idea, until winter and you're using the heat... :)
I was thinking the same thing in my back corners, but *not* using the
flexiduct, just the
corner blocked off. More damping of sound from the HVAC.
Here's a totally unrelated idea. I was just thinking about my staggered stud
walls, and the
fact that it's hard to block between the studs with anything thick, because of
the lack of
clearance between one set of studs and the other. Then I started thinking
about the fact
that every construction site has some kind of scrap OSB, plywood, MDF, etc.
which is pretty stiff laterally. Wouldn't it help in terms of stiffness if you
set a table
saw to rip all your scrap to about 2", and just ran 2 to 7' lengths of whatever
you've got up
the sides of your studs?
Sales Weasel From Mars