we have been told by the
fire marshal:
A: No
Fog Machines
B:
Haze has to be Water based.
This is why i'm looking at Hazers instead of foggers.
You might need a clarification on that ruling. The only water based
fog I've ever seen is one of those little hypersonic things that was being discussed in another thread on here. All
haze or
fog is a combination of water and either mineral oil of Gycol. In the OLD days
smoke and small
fog effects were acheived via the heating of Sal Amoniac in a small pan. Very icky, dangerous, and noxious. If the Fire suppression
system in your
theatre is dependent on certain types of sensors , the glycol or mineral oil residue can be very disruptive. I think you may need to ask for a clarification as a
hazer, say a DF-50 actually leaves more residue, especially on things high in the air, than a glycol based fogger does.
Fog machine residue tends to
settle, fall to the floor,
Haze tends to rise and condense on things in the air.
Just a quick primer for any who might not know,
Fog fluid is generally an emulsification of glycol, suspended in water. When run through a fogger the water boils, the resulting steam is forced through the front nozzle, where, upon contact with the colder air, the water vapor immediately condenses and is encapsulated by the gylcol, or mineral oil. These resulting "beads" of vapor retain the opacity to read like
fog. When they cool they fall, or they rupture releasing the water vapor, whilst the gycol plummets to Earth. Hazers tend to be Atomizers, or Nebulizers, and many work with no heat at all. They rely on forcing a water/glycol or water/mineral oil emulsification through a really really really ....really fine
screen. This basically does the same thing as a fogger, but the individual "
haze" particles are much, much,much smaller in diameter. So small in fact that they tend to hang in the air rising and fall on air currents and mini thermals. Since they are not dependent on the Endo-thermic < interior heat> energy of the water to rise. They can hang in the air a lot longer, Which brings me to the
point of this post, which is, Left on it's own
haze tends to condense on things like
smoke sensors and lighting fixtures and
truss, much more readily than chemical
fog does.
Besides, it's fun to argue with Fire Marshals, a little.