Fog Machines - Got Fog?
Fog Machines - Fog Machine
HOW FOG MACHINES WORK
INTRODUCTION
An introduction to Got Fog? and how it can help you with your Halloween Celebration.

HOW THEY WORK
Take a trip into the inner workings of a fog machine to see how they work.

FOG MACHINE FAQ
The largest fog machine frequently asked questions resource on the Internet.

BUYING GUIDE
Buying tips and product reviews for a variety of fog machines.

TIPS & TRICKS
Basic ideas and tips for using a fog machine for Halloween.

SPECIAL PROJECTS
A variety of how-to projects to enhance the effect of you fog machine.

FOG MACHINE SAFETY
These safety tips will help keep your Halloween festivities safe.

HALLOWEEN LINKS
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Fog Machines

Water based fog machines are the most commonly available types for both consumer use and commercial applications, and while there are many manufacturers of fog machines, and while there can be great differences in the design and quality of the components used by fog machine manufacturers, there operation is quite simple and almost always the same.

fog machinesThe fog fluid in the fluid tank is forced through a heat exchanger by a high pressure pump. The heat exchanger maintains a high temperature at which the fluid vaporizes in a process commonly known as "flashing". As the fluid is "flashed" it rapidly expands, and that expansion forces the vapor through the nozzle of the machine. When the vapor mixes with cooler air outside the fog machine, it instantly forms an opaque aerosol we see as fog. That's basically how most fog machines work. Below are more specific details of how the main components of a fog machine work.

fog machineThe Pump - In a fog machine, the pump plays the critical role of delivering fog fluid from the fluid tank to the heat exchanger. The most commonly used pump is a piston pump, and is carefully matched to the design of the heat exchanger. If a pump delivers fluid too quickly, the heater will turn off relatively quickly since too much fluid is moving through the metal block. This results in the machine shutting down to re-heat in a shorter time. The piston pump is the source for most of the noise generated by a fog machine.

fog machinesThe Heat Exchanger - Heat exchangers vary widely in design, materials, wattage and quality. A well engineered fog machine have take into account all these factors for optimum fog output and safety. Essentially, the heat exchanger is a block of metal, usually aluminum, with a heating element built into it to heat the metal block. The temperature of the block is regulated by a thermostat. A channel inside the metal block allows the fluid to travel through it to the nozzle. The wattage used to heat the exchanger is the specification most manufacturers use to describe how powerful their fog machines are.

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