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Posted by Abby Normal on November 18, 2006, 12:49 pm
5=2E7.4.1 of the 2002 NFPA 72 says 3 foot minimum. In the accompanying
hand book, they go on about the return grille 'diluting' the smoke. I
doubt a return has much influence at that far away. If anything I would
guess the smoke would migrate towards a return, get sucked in hence the
requirement of the duct mounted detectors.
daytona=B0 wrote:
> 24" to 48"...which puts it in the 36" range
> > NFPA 72 does not really differentiate between supply diiffusers and
> > return grilles or heat ing and cooling.
> > They want a three foot clearance.
> > The main reason being a supply in cooling could cool of the detector.
> > When the AC cycles off mositsure could condense inside of the detector.
> > Mositure can deflect light imilar to particles of smoke and cause
> > false alarms.
> > Glenn wrote:
> >> What is the code for the distance between a smoke detector and a return
> >> from a forced hot air system?
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> return grilles or heat ing and cooling.
> They want a three foot clearance.
> The main reason being a supply in cooling could cool of the detector.
> When the AC cycles off mositsure could condense inside of the detector.
> Mositure can deflect light imilar to particles of smoke and cause
> false alarms.
> Glenn wrote: