High Velocity Duct

Posted by Jack on September 19, 2008, 8:38 am

Is high velocity ducting worth installing in new construction? I have
my doubts about it as I've read that if installed by an inexperienced
contractor it can be noisy, and at best it sounds like rain. Do any
of you guys have any opinions or experience with it?

Thanks! Jack

Posted by Don Ocean on September 20, 2008, 1:47 am

Jack wrote:

> Is high velocity ducting worth installing in new construction? I have
> my doubts about it as I've read that if installed by an inexperienced
> contractor it can be noisy, and at best it sounds like rain. Do any
> of you guys have any opinions or experience with it?
>
> Thanks! Jack

Even well designed it is still noisy. Why the Hell, would anyone want it
in New construction? It is generally installed in older structures to
facilitate Air conditioning where the heat is Hydronic etc. It is used
only if duct work and an airhandler cannot be designed in properly.
There is a VHS of the installs given at some Johnstone Supply training
session from a few years ago. Maybe they still have it. Try ACCA or RSES.

Posted by on September 20, 2008, 2:14 pm

> Is high velocity ducting worth installing in new construction? =A0I have
> my doubts about it as I've read that if installed by an inexperienced
> contractor it can be noisy, and at best it sounds like rain. =A0Do any
> of you guys have any opinions or experience with it?
> Thanks! =A0Jack

There are tips and tricks that training will definately help with
noise issues, as well as making installation much simplier. In leiu
of traning, definately check out the manufacturer's websites and
submit heat/load calc to manufacture's engineers. Caveat, keep your
perspective on your job, they sometimes can make way more complicated
than it needs to be, but it will give you a chance to ask
questions...remember, they are vested in wanting their product to
perform and will be more than happy to support you out in the field.

As far as new construction. This is not the best application for the
current high-velocitiy systems out there when you have a chance to
design to the structure before the build. The conventional systems
have options that the hi-velocity systems do not currently have (i.e.
lack of choices and scalability--zoning for instances). IMHO, the hi-
velocity system is a great performing system for some applications;
but, they do have limitations that you shouldn't have to contend with
in a new build.

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