Fog, Haze & Low Fog
Very different effects, requiring different fluids and often different equipment.
Fog, as referred to in the event production industry, is an airborne smoke-like effect. Smoke consists of particles, while fog is vapor. This is created by vaporizing (utilizing heat) a mixture of purified water and poly functional alcohols, turning the liquid into an aerosol.
The effect can be anything from a quick burst which dissipates rapidly to a longer lasting, dense fog.
The difference comes from the balance of chemicals used in the fog fluid.
Fog Fluid, sometimes called Fog Juice, consists primarily of distilled water in combination with other chemicals such as propylene glycol and/or triethylene glycol (TEG).
When vaporized with heat, these chemicals produce tiny droplets. When they come into contact with cooler air particles outside the machine, it forms a cloud.
Haze is typically an atmospheric effect used for lighting enhancement. Everything from concerts to videography to laser shows utilize haze to capture light as it passes through the air.
Clean air does not contain sufficient particles to capture the beams of light, so a hazer or multiple hazers are deployed to provide a sufficient media. Moving lights and lasers would just be light on the ground or wall without haze. Ever seen a picture or video where you can see beams of light streaming through a window? That typically doesn’t occur without a small amount of haze in the air.
Haze can be produces three ways, with a fog machine utilizing a special formula of glycol fluid, with a specialized haze machine designed to vaporize glycerin based fluid, or atomizing food grade mineral or a special water basedf fluid with compressed air.
The fog machine style tends to hang in the approximately 15 to 20 minutes, sepending on air circulation and humidity. The glycerin formula haze machines tend to have a longer hang time.
The pressurized air, atomizer machines utilizing food grade mineral oil tend to produce the finest haze with the longest hang time, up to 2 to 3 hours unless exhausted from the room.
Low lying fog is a tough effect to produce efficiently.