Flat Fan vs Full Cone: Which Spray Pattern for Your Job

The Short Answer
What Each Pattern Is
Coverage: Band vs Circle
Evenness: Where Each Wins
Impact and Penetration
Clog Resistance
Side-by-Side Comparison
How to Choose: Decision Table
Common Mistakes
FAQ
The Bottom Line

The Short Answer

Flat surface, band of liquid → flat fan. Wash a belt, coat a web, spray a boom.
Volume or round area, even patch → full cone. Cool a part, quench, wet a pile, rinse a tank wall.

The pattern is the target geometry. Flat fan for two-dimensional surfaces; full cone for three-dimensional volumes and round footprints. One is not “better”. They are for different shapes.

The flat fan vs full cone decision is the first fork in every spray specification: match the pattern to the target shape and the sizing follows.

What Each Pattern Is

Flat fan: liquid forced through a slit orifice forms a thin sheet that opens into a band. On a wall it leaves a rectangle (or ellipse at distance). The band’s width is set by the spray angle and the standoff. See flat-fan-nozzles.

Full cone: liquid fed through a swirl chamber exits as a solid cone; on a surface it leaves a filled circle. The spray is even across the circle, not just the edge. See spiral-nozzles (our SP full-cone line, SP-1/8 to SP-1/2, free passage 2.5–9 mm).

The difference is the orifice: a slit makes a fan, a swirl chamber makes a cone. Pressure changes the size of each, never the kind.

Coverage: Band vs Circle

	Flat fan	Full cone
Footprint	Band / rectangle	Filled circle
Best target	Flat, 2D surface	Volume, round area
Overlap method	Bands side by side	Cones overlapping
Edge control	Even or tapered edge options	Even across the circle
Typical angle	15–110°	30–120° cone angle

A flat fan covers a strip; you tile strips to cover a plane. A full cone covers a disc; you overlap discs to cover an area. For a moving belt or a boom, the fan’s strip is natural. For a stationary part or a tank, the cone’s disc is natural.

Evenness: Where Each Wins

Flat fan: even across the band (if the pressure is right and edges overlap). Butt two bands together and you get an even plane. That is the whole trick of a spray boom or a wash header.
Full cone: even across the circle. No hot centre, no dry ring. That is why it is the default for cooling a round part or wetting a pile.

Where a flat fan struggles is a 3D object. The band only wets the face it hits. A full cone wraps a round part better. Where a full cone struggles is a wide flat belt. You need many cones tiled, which a fan does natively.

Impact and Penetration

Flat fan: low impact per unit area; it spreads force across the band. Good for gentle washing, bad for cutting or descaling.
Full cone: moderate impact at the centre, falling to the edge; enough to wet and penetrate a surface, not to cut.
For real impact: neither; you want a solid jet (jet nozzles). A fan and a cone spread; a jet concentrates.

If the job needs force (descaling, jet cleaning), both fan and cone are wrong. That is a jet duty.

Clog Resistance

Full cone (especially spiral) wins on clogging:

Spiral full cone: the open, single-channel path has a large free passage (our SP line: 2.5–9 mm). Recirculated or gritty water passes; it is the standard for scrubbers and dirty water.
Flat fan: the slit orifice is narrow; grit sieves it. On clean water fine, on dirty water it clogs.

For recirculated or particulate-laden fluid, full cone (spiral) is the safer pattern. For clean water, the fan’s clog risk is low.

Side-by-Side Comparison

Factor	Flat fan	Full cone (spiral)
Pattern	Band	Filled circle
Target	Flat surface	Volume / round area
Evenness	Across band	Across circle
Impact	Low (spread)	Moderate (centre-high)
Clog resistance	Lower (slit)	Higher (open path, 2.5–9 mm)
Best for	Wash, coat, boom	Cool, quench, wet pile, tank
Our line	15–110°, even/tapered edge	SP-1/8 to SP-1, full & hollow

Neither is universal. The target shape decides.

How to Choose: Decision Table

Your target	Choose
Flat belt, web, conveyor	Flat fan
Crop boom, broadcast	Flat fan
Round part to cool/quench	Full cone
Dust pile to wet	Full cone (wide angle, low pressure)
Tank wall to rinse	Full cone (rotary, see `tank-cleaning-nozzles`)
Scrubber packing	Hollow cone (ring): not full
3D part to coat	Full cone or air atomiser
Need impact	Solid jet (not fan or cone)

The table is the decision. Match the target, pick the pattern, then size the nozzle.

Common Mistakes

Fan on a round tank wall: you get a band, not wall coverage. Full cone (rotary) wraps it.
Cone on a wide belt: you tile discs and leave diamonds between them. Fan does it in one strip.
Raising pressure to fix coverage: it scales the size, not the shape. A fan stays a band.
Full cone in gritty water without checking passage: a small orifice cones clog. Use a spiral with large free passage.
Confusing full and hollow cone: hollow leaves the centre dry; for even patches you want full.

FAQ

Q: Can a flat fan do what a cone does? A: Only on a flat surface. On a volume or round area, a fan leaves gaps. Use the cone for 3D targets.

Q: Which is better for dust suppression? A: Full cone. A wide-angle full cone at low pressure lays an even round patch of coarse drops on the pile. A fan would stripe it.

Q: Which clogs less? A: Full cone, specifically a spiral with a large free passage. The open path passes grit that sieves a fan slit.

Q: I need impact, fan or cone? A: Neither. Both spread force. Use a solid jet for cutting or descaling.

Q: Can I use a cone on a spray boom? A: You can, but a fan is natural for a boom. The band tiles into an even strip. Cones leave diamond gaps unless overlapped heavily.

Worked Example: A Conveyor Wash

A food line runs a 600 mm wide belt at 0.5 m/s; it needs an even wash.

Target: flat belt → flat fan (not a cone; the belt is 2D).
Band width: at 300 mm standoff, a 65° fan makes ~350 mm band. Two nozzles side by side (staggered) cover 600 mm with overlap.
Flow: wash rate sets the orifice; pressure holds the band shape (3 bar typical).
Fluid: clean wash water → fan slit clog risk low.

A cone here would leave diamond gaps between discs. The fan tiles the belt in one even strip. Pattern first, numbers second.

Worked Example: Cooling a Cylindrical Part

A 200 mm diameter steel part needs even cooling as it exits a furnace.

Target: a 3D round part → full cone (a fan only wets the face it hits).
Coverage: a full cone sized so the circle covers the part; several nozzles around the part for wrap.
Droplet: coarse enough to reach, fine enough to cool fast. Pressure sets it.
Fluid: clean coolant → spiral free passage not critical, but 316L for the heat.

A fan would streak the cylindrical surface. The cone wraps it. Target shape decides.

Industry Applications

Industry	Pattern	Why
Food belt wash	Flat fan	Even strip on a flat belt
Crop spraying	Flat fan	Boom bands tile the field
Metal quenching	Full cone	Even round patch on the part
Dust suppression	Full cone (wide)	Even wet on the pile
Tank CIP	Full cone (rotary)	Wall coverage as it turns
Glass / web coating	Flat fan	Even film on a flat sheet
Scrubber	Hollow cone	Ring meets the packing

Each application is the target shape, expressed as a pattern.

Selection Checklist (Print This)

Target shape identified: flat (fan) or volume/round (cone)
Evenness requirement set: across band or across circle
Impact need checked: low (fan/cone) or high (jet)
Fluid checked: clean (either) or gritty (spiral full cone)
Nozzle sized for flow and pressure
Internal links reviewed: pattern → matching product page

The Physics: Why a Slit Makes a Fan and a Swirl Makes a Cone

The pattern is geometry, fixed at the orifice:

Slit orifice: liquid exits a narrow rectangular gap; surface tension and momentum shape it into a sheet that unfolds into a fan. The slit width sets the band; the length sets the angle.
Swirl chamber: liquid enters tangentially (or axially with a swirl insert), spins, and exits as a cone. Axial feed → full cone (liquid across the exit); tangential → hollow cone (liquid on the wall).

No pressure change converts one to the other. A fan at 5 bar is a wider, finer fan, still a fan. This is why pattern selection is a nozzle choice, not a pump setting.

Full Cone Variants: Spiral vs Standard

Not all full cones are equal:

Spiral full cone: liquid travels a single open helical path; the free passage is large (our SP line: 2.5–9 mm). Clog-resistant, the scrubber standard. See spiral-nozzles.
Standard swirl full cone: a smaller internal chamber; finer atomisation, smaller free passage. Used where drop size matters more than clogging.

For dirty water, the spiral wins on passage. For fine drops on clean fluid, the standard swirl. The “full cone” label covers both: check the free passage for your fluid.

Edge Types: The Flat Fan Detail

Flat fans come in two edge types that matter for overlap:

Even edge: the band’s intensity is uniform across its width. Best when bands overlap (booms, headers): the overlap stays even.
Tapered edge: the band fades at the edges. Best for a single wide fan or when you want soft edges without a hard line.

The edge type is a pattern sub-choice. For a tiled boom, even edge; for a standalone wash, tapered. Pick it with the overlap in mind.

When the Cone Should Be Hollow, Not Full

A caution on “full cone”: some duties want the hollow variant, a ring, not a disc:

Gas scrubbing: the ring of liquid meets the packing; a full cone’s centre drop falls through the gap and is wasted. Hollow cone (spiral-nozzles SP-3/4, SP-1) is correct.
Edge coating: where only the rim matters, a ring targets it.

“Full cone vs flat fan” is the common comparison, but within cones, full vs hollow is its own decision. Match the footprint to the target.

What to Send a Supplier

Target shape: flat surface (fan) or volume/round (cone). This is the pattern decision.
Fluid: clean or gritty; gritty → spiral full cone for passage.
Coverage need: band width or patch diameter; this sizes the angle and the overlap.
Droplet / impact need: gentle wash or penetration; sets pressure and orifice.

With those four, the quote comes back with a pattern and a size. Without the target shape, every supplier guesses.

Quick Reference: Pattern Picker

You said…	Pattern	Nozzle
“a flat belt”	Flat fan	Flat-fan
“a round part”	Full cone	Spiral (full)
“a pile of dust”	Wide full cone	Spiral, low pressure
“a tank wall”	Full cone rotary	Tank-cleaning
“a scrubber”	Hollow cone	Spiral (hollow)
“I need to hit it hard”	Solid jet	Jet

Thirty seconds to the pattern, then size it.

One Sentence Before You Spec

Tell the supplier the target shape and the fluid, and the flat-fan-vs-full-cone question answers itself: flat surface takes a fan, volume or round area takes a cone. The rest is flow and pressure.

Pressure and the Pattern: A Note

Pressure changes the size of a pattern, not its kind. A 65° flat fan at 1 bar is a narrower, thinner band; at 5 bar it is wider and finer, but still a band. A full cone at low pressure is a small disc; at high pressure a large one, but still a disc. If coverage is wrong, the answer is a different pattern or angle, not a pump tweak. This is the single most misunderstood point in nozzle selection.

The Pattern Is the Product

When you buy a nozzle, you are really buying a pattern sized for a duty. The flat-fan-vs-full-cone question is the first fork in every specification, and getting it right is the difference between even coverage and gaps that no amount of pressure fixes. Match the target shape, size the nozzle, and the job is done the first time.

See both families on our products page, or send your target shape and fluid and we’ll specify the pattern.

A Note on “Best”

There is no best between flat fan and full cone: only a right one for the target. The comparison exists because buyers confuse them; the answer is always the geometry. Flat fan for the belt, full cone for the part. Hold that and the rest of the spec follows.

Two Real Quotes, Two Patterns

“We wash a 1 m steel plate on a line.” → Flat fan, two or three bands tiled, even edge, 3 bar. The plate is flat; the fan is the pattern.
“We cool a 300 mm ball valve after welding.” → Full cone (spiral), several around it for wrap, coarse drop. The valve is 3D; the cone wraps it.

Same industry, same fluid (water), opposite patterns, because the targets differ. The pattern is never “the standard nozzle”; it is the target.

The Pattern Checklist, One More Time

Before you spec, answer: flat or round? Band or disc? The answer is the pattern. Then size for flow and pressure. This two-step (pattern first, numbers second) prevents 90% of coverage failures, and it is exactly what the flat-fan-vs-full-cone comparison is for.

Flat fan and full cone are not a quality contest. They are a geometry match. Flat fan for flat surfaces (bands that tile into a plane), full cone for volumes and round areas (even discs that wrap a part). Match the target shape, size the nozzle for the duty, and the coverage is right the first time. For gritty water, the spiral full cone’s open path clogs less than a fan slit; for a round tank wall, a rotary full cone beats a fan every time.

See both families on our products page, or send your target shape and fluid and we’ll specify the pattern.## From Comparison to Specification

Once the pattern is decided, the rest of the spec is mechanical: pick the angle for the band or patch width, the orifice for the flow, the material for the fluid, and the pressure for the finish. The flat-fan-vs-full-cone question is the only fork that changes the shape of the coverage. Everything after it is sizing. Send us the target shape and the fluid and we will return a pattern and a size, not a catalogue to browse.

The pattern is the product. Choose it for the shape, and the coverage takes care of itself.

Flat fan for the belt, full cone for the part: the rest is just numbers.

Get the shape right and the nozzle sizes itself.

The Bottom Line