[SML] Smoke, heat, fire sensors for HVAC systems

[Bill Nelson]

Oops! I somehow sent the reply before I had finished composing it.

The theatre also had ionization detectors in the fly tower - which were also sensitive to theatrical smoke. The theatre was 
finally able to convince the fire marshal to allow changing the detectors to rate-of-rise sensing. No more false triggers
from the fly loft. 

A theatre I once worked in had an ionization detector in the return air duct. Theatrical smoke would sometimes trigger
the alarm, so we had to disable the detector and hire an off-duty fireman to stand watch. 

Bill


----- Original Message -----
From: Dale Farmer via Stagecraft <stagecraft at theatrical.net>
To: stagecraft at theatrical.net
Cc: Dale Farmer <dale at cybercom.net>
Sent: Mon, 25 Jan 2021 13:54:46 -0500 (EST)
Subject: Re: [SML] Smoke, heat, fire sensors for HVAC systems

I was peripherally involved with getting such a system working many 
years ago.  It involved getting a fire engineer study of the building 
and alarm systems.  The eventual outcome was that the sensors in the air 
ducts and auditorium were able to be selectively disabled, and we had to 
hire a fireman on detail duty to be on site whenever they were disabled.

One kind of smoke detector is beams of light up near the ceiling shining 
across the room to a detector on the opposite wall. They detect balloons 
just fine. surprise!

Dale


On 1/25/2021 1:21 PM, Ben Thoron SML via Stagecraft wrote:
> Our 10-year-old theatre was installed with sensors in the HVAC system
> that are easily set off by theatrical smoke and haze, to the extent
> that we can’t use either, at all.
> 
> I’m looking for a source that knows more about the options and devices
> than I do.
> 
> Any suggestions?
> 
> 
> 
> Ben
> 
> 
> 
> Ben Thoron | Production Manager | the old globe | 619-684-4105 direct
> | 619- 846-9529 cell | he him his | bthoron at theoldglobe.org
> 
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