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Posted by longshot on August 7, 2007, 9:58 am
> hello, a couple of weeks ago I posted a question regarding raising the
> main rectangular duct trunk up 4 inches to gain headroom in my basement.
> Thanks to all who responded. Raising the main trunk will be the easy
> part. It's the transition piece that I am unsure of...
> .
> I will need to get some sort of galvanized 4" riser. If I make one
> myself, how long should the riser be? In other words, to help the
> airflow, I don't think I should use an elbow. My thought was the riser
> should gradually taper up 4" over a couple of feet. Also, if I screw this
> up, any ideas what it would cost a sheet metal guy to make one of these?
> The duct is rectangular 18" x 10".
> .
> Thank you for your time.
>
maybe 50 bucks.
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