Hi Mat,

Even if you only run 1  16" fan on low, sucking air INTO the canteen while
the 9" is exhausting from the smoke room would probably be adequate for most
of the problem (although it will not make sufficient differential to prevent
bodies exiting the smoke room to the canteen from dragging some smoke filled
air into the canteen). That assumes equal or positive air pressures from
rooms ajoining the canteen which can have significant impact to the overall
effectiveness.

One thing is clear... as soon as a 16" fan is set on exhaust to blow out of
the canteen, stale smoke will exit the smoke room and enter the canteen
because the 16" fan will easily overcome the 9" exhaust. I would disable the
reversing switch on the 16" fans. Gee, you'd think with all this blowing and
sucking nobody would be complaining.

Good Luck,
Bruce

> ----------
> From:         Matthew
> Lamkin[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;Matthew Lamkin
> Sent:         Friday, August 18, 2000 3:18 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] Any ventilation experts out there?
>
> Hi again, thanks for the replies.
>
> Its looks like my ASCII drawing didn't make it, never mind.
> The 2 fans external to the smoke room are fixed into the wall that leads
> to the outside world (whatever that is!)
> and can blow or suck, at 3 different speeds.
> The fan in the smoke room is only a household 9" one that's sucking the
> air "out" of the smoke room to the outside world.
> (I believe that I can get tickets to visit this place, maybe I'll go
> someday!!).
>
> So it looks like we have to set the 16" fans outside the smoke room to
> suck air into the canteen at full rate.
> Oh dear, now they're going to complain "its cold in here"!! as the cold
> air from outside is sucked in & then they'll turn the fans off
> and forget to turn them on again.
>
> It looks like I'm in a no win situation. Maybe I'll have to start taking
> my lunches and eating them elsewhere.
>
> <PS Is it irony that you work for a fire detection company?>
> (Yes Hans, it is isn't it. Now you don't even want to get me started on
> our fire drills he, he.)
>
>
> >
>
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