Haze machine

Unlike theatrical fog, which is typically intended to be dense and/or opaque, haze is generally very light and subtle.

These properties allow a venue to be filled with haze prior to or during an event without creating an overtly distracting cloud.

Haze typically has a substantially longer persistence ("hang time") than conventional theatrical fog.

Crackers work by use of a spray pump powered either by electricity or compressed CO2 passing through a dispersion head into a fluid reservoir.

Ultrasonic haze machines use transducers submerged in a reservoir of fluid to create atmospheric effects.

A haze machine with remote control
Haze can reveal beams of light from stage lighting instruments without obscuring the view of actors onstage.
A laser passing through fog