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Cold Spark Fountains: The Shape of the Effect and How Many Machines it Takes

A cold spark fountain is a cone of glowing metal particles thrown out of a nozzle by a blower, holding its shape for the length of the activation and then falling as cooled grain. A mini reaches 8 to 12 ft, a standard floor machine 12 to 18 ft, and a high-output unit past 30 ft. The rest of this page is geometry: how many machines, how far apart, and which direction.

What a single fountain looks like

One nozzle produces a narrow cone that widens as it rises, dense at the base and feathering at the top. It holds while the machine runs and collapses within about a second of the cue ending, which is what makes it cue-able against music in a way a conventional effect isn't.

A single spark fall is roughly 2 feet wide at its working width. That number is the basis for every formation on this page, so it's worth holding onto.

Colour is set by the chemistry and the temperature rather than by anything you can control: white-silver at the hottest, through gold, to red-orange as particles fade. There's no blue, no green, and no electronic colour control on any machine in the category. Our cold spark granules page covers grades and composition.

The effect is close to silent. What you hear is the blower and the motors, a steady hum, with no report and no concussion, which is why these get placed near speaking talent and open microphones. Granules are heated in a chamber and thrown out by a fan, and the full explanation of how cold spark machines work sits in our main guide.

Height by machine class

Class	Height	Ceiling needed	Typical use
Mini	8 to 12 ft	20 ft plus	Weddings, small rooms, dance floor edges
Standard floor	12 to 18 ft	25 ft plus	Corporate stages, clubs, most indoor work
High output	Past 30 ft	Outdoor or arena	Festival stages, arena reveals
Jet/burst	25 to 30 ft ball	Outdoor or arena	Single-moment punctuation
Downward fall	12 to 18 ft drop	Rigging height plus drop	Truss-mounted curtains, reveals
Horizontal	1 to 5 m at up to 30 degrees	Wall clearance rather than ceiling	Stage edges, runway lines

We plan 20 to 25 ft of ceiling clearance measured from the top of the machine, and nothing combustible overhead. Our cold spark safety guide explains where those figures come from.

Running a tall machine in a short room doesn't solve the problem by turning the height setting down. Output drops, the fountain gets denser and messier at the base, and the fallout pattern changes. Use a smaller machine.

Fountain formations

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Single machine

One unit as an accent or a focal mark: a cake table, a podium, the top of a staircase. The eye goes to it and stays for the duration, which makes a single fountain better for punctuating a moment than for filling a stage.

Gateway pair

Two machines opposite each other, fired together, so whoever walks between them passes through a corridor of sparks. Machines set to the same DMX address fire simultaneously, which is what makes the pair read as one effect.

Gateway spacing is driven by the fallout calculation rather than by the look, and in practice it works over a 4-foot stage or runway with the machines flanking on the ground or on the stage deck. Closer than that raises safety concerns and we won't run it. A wider entrance takes 4 machines, 2 per side.

Fountain wall

A line of machines on the same axis at even spacing, fired together, so the individual cones overlap into one sheet across a stage front or a dance floor edge.

Spacing runs 2 to 6 feet apart. Since each fall is about 2 feet wide, machines at 2 feet give a continuous unbroken sheet, and anything wider gives visible gaps between the falls. Both are legitimate looks. A continuous wall reads as a curtain; 5 or 6 feet apart reads as a row of distinct fountains, which suits a wide stage where you want the line to feel deliberate rather than solid.

4 machines make a short wall. 6 to 8 covers a festival stage.

Crisscross

Crisscross means hanging machines and ground machines offset from each other rather than stacked, so each hung unit fills the space between two floor units and each floor unit fills the space between two hung units. The result is a full plane of sparks with no vertical alignment, which reads much deeper on camera than a single line does.

It's the formation that needs the most planning, because the rigged units bring safety cables, weight ratings, and a second fallout calculation with them. Our cold spark machine for concerts page covers rigging.

Downward

Machines rigged overhead, dropping the effect into the space. Common on car unveilings alongside a Kabuki drop, and on broadcast where a curtain of falling sparks frames talent walking out. Downward fall units cap around 12 to 18 ft of drop.

Horizontal

Side-throw units angled up to 30 degrees, reaching 1 to 5 m. These live along stage edges, runway lines, and truss verticals. Aiming sideways moves the fallout laterally, so the clearance calculation gets redone for the new geometry rather than carried over from the vertical plan.

How machine count changes the look

Clients book in even numbers because formations are symmetrical. As a working guide: 2 for an entrance or a first dance gateway, 4 for a dance floor surround or a stage flank, 6 to 8 for a festival stage.

Mixing classes inside one look works when the classes are placed deliberately. A corporate general session we ran for Mary Kay used 20 machines across a convention centre stage roughly 100 ft side to side plus a 20 ft runway 4 ft wide, with 8 minis in the centre and full-size units to the outside. The minis kept the centre readable at close range while the outer units carried the width of the room.

Matching class within a single formation matters more than matching across the stage. A wall built from mixed heights reads as a mistake rather than a design choice, because the eye picks up the uneven top line immediately.

We've also spelled words and built boxes and letters from combinations of machines on stages with room for it, which needs an even, planned grid rather than an improvised line. Wedding placement per moment sits on our cold spark machine for weddings page. Volume pricing applies on 2, 4, or 6 units, which is another reason even numbers are the norm, and current stock by output class is on our cold spark fountain machines for sale listings.

How grain size changes the shape

Larger grain carries more heat, travels higher, and gives a taller, looser fountain with a wider fallout radius, so it needs more standoff from people and set pieces. Smaller grain gives a tighter, denser cone at lower height, which is why indoor grades are the smaller ones.

From the front, a wrong-grain fountain looks thin and ragged at the top or throws visible unburnt grain onto the floor. It's a clearance problem before it's a look problem, because the fallout radius the plot diagram was built on no longer applies. Grade selection by machine and venue is on our cold spark granules page.

Activation length and how the fountain reads in time

Most machines cap a single activation at 30 seconds as thermal protection, and the operator re-triggers with a slight dip in height on the restart. Wedding activations typically run 10 to 30 seconds. Design cues inside that limit rather than against it.

A 200g granule pack gives 12 to 15 minutes of cumulative run time on a standard machine, and a 50g pack gives 3 to 4 minutes on a mini, so one pack covers a lot of cues. High-output units burn around 70 g/min and empty a pack far faster.

Short beats long. A 10-second fountain landing on a downbeat reads bigger than a 25-second one that outlives the moment it was built for, because the audience stops watching an effect that's still running.

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Lighting the fountain, and what it does on camera

Room lighting is the only real control over how intense the effect looks. Bright light washes the sparks out, a darker room dramatises them, and that's the lever to reach for when a client asks for more impact.

On camera the effect reads stronger than it does live, because a camera holds each particle trail as a streak. A fountain that looks moderate to the eye can look overwhelming on a broadcast cut, which is worth a conversation with the director before the cue is set.

Colour can't be brand-matched, so a brand-colour brief gets solved with lighting and content rather than with the sparks. Outdoors this is a night effect, since daylight kills it entirely, and crosswind will carry particles outside the calculated fallout zone. We call wind case by case on speed and gusts, judged on whether sparks would leave the intended pattern or blow into people, set pieces, or equipment.

Frequently asked questions

What is a cold spark fountain?

A cold spark fountain is the visible effect: a cone of glowing metal particles thrown out of a nozzle by a blower, holding a defined shape for the length of the activation and then falling as cooled grain. The word covers both a single machine firing upward and a formation built from several machines aimed to read as one continuous shape.

How high does a spark fountain go?

Mini machines reach 8 to 12 ft. Standard floor units reach 12 to 18 ft, which is the working range for most indoor rooms. High-output machines push past 30 ft, and jet units throw a ball of sparks 25 to 30 ft. Downward and horizontal machines cap around 12 to 18 ft. CryoFX plans 20 to 25 ft of ceiling clearance above the machine.

How many machines do I need for a gateway effect?

2, placed opposite each other and fired together so whoever walks between them passes through a corridor of sparks. Machines set to the same DMX address fire simultaneously, which is what makes the pair read as one effect rather than 2. Wider entrances take 4 machines, 2 per side. Clients book in even numbers for exactly this reason.

What is a fountain wall?

A line of machines at even spacing along the same axis, fired together, so the individual cones overlap into a single sheet of sparks across a stage front or dance floor edge. 4 machines make a short wall and 6 to 8 covers a festival stage. Spacing runs 2 to 6 feet, and since each fall is about 2 feet wide, 2 feet apart gives a continuous sheet.

Can spark fountains fire downward or sideways?

Yes. Downward machines rig overhead and drop the effect, which is common on car unveilings alongside Kabuki drops. Horizontal units throw sideways, with the iSparkFX horizontal model reaching 1 to 5 m at up to 30 degrees. Both cap around 12 to 18 ft of throw, and both move where the fallout lands, so the clearance calculation gets redone for the new geometry.

How long does one fountain activation last?

Most machines time out at 30 seconds per activation as thermal protection, and the operator re-triggers if the moment runs longer. Most cues finish well short of that limit. A 200g granule pack gives 12 to 15 minutes of cumulative run time on a standard machine and a 50g pack gives 3 to 4 minutes on a mini, so one pack covers many activations.

Does grain size change the shape of the fountain?

Yes. Larger grain carries more heat, travels higher, and gives a taller, looser fountain with a wider fallout radius, so it needs more standoff from people and set pieces. Smaller grain produces a tighter, denser cone at lower height, which is why indoor granules are the smaller grade. Running outdoor grain indoors changes both the shape and the clearance required.

What does a spark fountain look like on camera?

It reads stronger on camera than live, because a camera holds the particle trails as streaks. Room lighting is the main control: bright light washes the sparks out and a darker room makes them dramatic. Colour is fixed by the chemistry at gold, white-silver, and red-orange, so plan the look around lighting levels rather than a brand colour match.

Updated - 08/08/2026.