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Posted by William on June 13, 2005, 3:07 am
>
> > Hello I'm installing a HVAC system that is supplying a mixed use
> occupancy.
> > A dwelling unit, and a very large garage. These occupancies are
separated
> > by a fire wall as required by the local code. It seems to me, that I
need
> a
> > fire dampers on the supply and return ducts as they are passing through
> the
> > firewall, but do I need fire smoke combination dampers? Of course
they
> > are much more expensive, and as far as I can see it's a fire wall, not a
> > smoke barrier that is required between these occupancies.
> >
> > --
> > Thanks
> > William.......
> >
>
> Installing with out an approved set of plans?
>
> Anything that passes through a fire wall needs special attention. What
> rating is your fire wall?
> Assuming that a fire wall does not control smoke is not correct.
>
> Get in contact with the building inspection authority and find out.
The wall requirements are for 1 hr and 20 min door for the above. I'm
using a 2 hr wall and 90 min doors so a 1.5 hr damper is all that would be
required for either wall as far as I can see from reading about the specs
for the dampers. Docs seem to say you don't need a 3hr damper untill you
get to 3 or greater rated walls...
William
>
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