Why Outdoor Digital Signage Is Shifting from Axial Fans to High Static Pressure Splash Proof Centrifugal Fans? | SANYO DENKI San Ace Cooling Solution

Why Are Traditional Axial Fans Reaching Their Limits?

Many engineers initially focus only on airflow volume when selecting fans.

However, for modern slim digital signage systems, the key parameter is often not airflow volume, but static pressure.

High Static Pressure Is More Important Than Large Airflow

Characteristics of Traditional Axial Fans

Traditional axial fans typically provide:

• Large airflow

• Simple structure

• Lower cost

However, they generally offer limited static pressure performance.

Once airflow resistance increases due to:

• Narrow airflow channels

• Dense internal structures

• Heat sinks

• Dust filters

• Waterproof structures

the cooling efficiency of axial fans drops significantly.

Even if the airflow specification appears large, air may not effectively penetrate the system.

High Airflow Resistance Is the Real Challenge in Thin Digital Signage

Inside ultra-thin outdoor displays, airflow paths become extremely restricted.

Heat tends to accumulate around:

• LED backlight areas

• Power modules

• Upper enclosure sections

• Structural dead zones

Traditional axial fans often encounter problems such as:

• Insufficient airflow penetration

• Poor heat exhaust efficiency

• Severe local hot spots

This is one of the primary reasons many outdoor digital signage systems experience thermal alarms during summer operation.

Why Are Splash Proof Centrifugal Fans Becoming Popular?

Compared with traditional axial fans, Splash Proof Centrifugal Fans provide several major advantages.

The most important advantage is:

High static pressure capability.

Why High Static Pressure Matters

Unlike axial fans, centrifugal fans redirect airflow by approximately 90 degrees internally.

This structure allows them to generate significantly higher static pressure.

Higher static pressure means the fan can:

• Push air through narrow channels

• Overcome airflow resistance

• Improve deep thermal penetration

• Remove trapped hot air more effectively

For ultra-thin digital signage systems, this capability is critical.

Axial Fans vs Splash Proof Centrifugal Fans

As airflow resistance continues increasing in modern signage systems, high static pressure cooling solutions are becoming more important than simple airflow volume specifications.

Why Outdoor Digital Signage Requires Splash Proof Fan Designs

Outdoor equipment operates under harsh environmental conditions, including:

• Rain exposure

• High humidity

• Condensation

• Dust

• Salt spray

• Rapid temperature fluctuations

In many cases, failures are caused not by direct rain intrusion, but by long-term condensation inside the enclosure.

Therefore, cooling fans used in outdoor digital signage systems must provide reliable water and dust protection.

What Is a Splash Proof Fan?

A Splash Proof Fan is a cooling fan designed for environments exposed to water and dust.

Its core design principle involves:

• Resin coating of motor coils

• Protection of PCB circuits

• Sealing of electrical components

This structure helps prevent water and dust intrusion into energized electrical areas.

Understanding IP54, IP55, and IP68

Common protection ratings used in outdoor digital signage applications include:

IP68 protection is widely used in demanding applications such as:

• EV chargers

• Energy storage systems

• PV inverters

• Industrial outdoor equipment

Why PWM Control Is Becoming Increasingly Important

Modern digital signage systems are increasingly adopting PWM-controlled fans.

This allows fan speed adjustment based on actual thermal load.

Advantages of PWM Control

For shopping malls, airports, subway stations, and other public areas, low acoustic noise has become a critical design requirement.

PWM functionality is now considered a key feature in premium digital signage cooling systems.

Customization Is Becoming Essential

As display sizes continue increasing, internal layouts become more complex.

Many projects now require:

• Customized cable lengths

• Special connectors

• PWM parameter tuning

• Optimized airflow path integration

Flexible customization capability is becoming increasingly important in fan selection.

Why SANYO DENKI Splash Proof Fans Are Widely Used

SANYO DENKI Splash Proof Fans are widely used in high-reliability applications including:

• Digital signage

• EV charging stations

• PV inverters

• Energy storage systems

• Industrial equipment

Key advantages include:

In particular, Splash Proof Centrifugal Fans are becoming increasingly important for slim outdoor digital signage projects.

Why the Industry Will Continue Moving Toward Centrifugal Cooling Solutions

Future outdoor digital signage systems will continue evolving toward:

• Thinner structures

• Higher brightness

• Higher power density

• More compact airflow paths

• More complex thermal layouts

This means airflow resistance will continue increasing.

As a result, high static pressure performance will become more important than simply maximizing airflow volume.

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In the past, digital signage thermal design primarily focused on achieving larger airflow.

Today, the industry is shifting toward:

• High static pressure

• Splash Proof protection

• Intelligent PWM speed control

• Thin-system airflow optimization

This is why more outdoor digital signage manufacturers are transitioning from traditional axial fans to Splash Proof Centrifugal Fan solutions.

For thermal engineers, future fan selection should not focus solely on CFM airflow ratings.

Instead, engineers should evaluate:

• Static pressure performance

• Airflow path resistance

• Protection ratings

• PWM control capability

• Long service life

• Outdoor operational reliability

Only then can thermal issues in modern slim digital signage systems be solved effectively over the long term.

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San Ace Splash Proof Centrifugal Fan【SANYODENKI San Ace IP54/IP56/IP68 Splash Proof Centrifugal Fan】

型号	产品 名称	风扇 尺寸 (MM)	风扇 厚度(MM)	额定 电压 (V)	额定 电流 (A)	额定 功率 (W)	额定 转速 (min-1)	最大 气流 (m3/min)	最大 气流 (CFM)	最大 静压 (Pa)	最大 静压 (inchH2O)	噪音 (dBA)	预期 寿命 (h)	传感器 类型	IP防护 等级	PWM控制功能	Ribbed
9W2TM24P4G001	Splash Proof Centrifugal Fan	φ100	25	24	0.7	16.8	7400	2.03	71.7	708	2.84	65	40000/60℃ (70000/40℃)	Pulse sensor	IP68	Yes	No
9W2TM24P4H001	Splash Proof Centrifugal Fan	φ100	25	24	0.44	10.56	6400	1.77	62.5	560	2.25	60	40000/60℃ (70000/40℃)	Pulse sensor	IP68	Yes	No
9W2TM48P4G001	Splash Proof Centrifugal Fan	φ100	25	48	0.35	16.8	7400	2.03	71.7	708	2.84	65	40000/60℃ (70000/40℃)	Pulse sensor	IP68	Yes	No
9W2TM48P4H001	Splash Proof Centrifugal Fan	φ100	25	48	0.22	10.56	6400	1.77	62.5	560	2.25	60	40000/60℃ (70000/40℃)	Pulse sensor	IP68	Yes	No
9W2TJ24P0H001	Splash Proof Centrifugal Fan	φ133	91	24	1.2	28.8	4150	6.39	225	395	1.59	61	40000/60℃ (70000/40℃)	Pulse sensor	IP68	Yes	No
9W2TJ48P0H001	Splash Proof Centrifugal Fan	φ133	91	48	0.55	26.4	4150	6.39	225	395	1.59	61	40000/60℃ (70000/40℃)	Pulse sensor	IP68	Yes	No
9W2TN24P1H001	Splash Proof Centrifugal Fan	φ150	35	24	0.64	15.4	3800	3.83	135	390	1.57	59	40000/60℃ (70000/40℃)	Pulse sensor	IP68	Yes	No
9W2TN48P1H001	Splash Proof Centrifugal Fan	φ150	35	48	0.32	15.4	3800	3.83	135	390	1.57	59	40000/60℃ (70000/40℃)	Pulse sensor	IP68	Yes	No
9W2TGA48P0G001	Splash Proof Centrifugal Fan	φ175	69	48	3.85	184.8	5700	17.3	611	1100	4.42	80	40000/60℃ (70000/40℃)	Pulse sensor	IP56	Yes	No
9W1TG48P0S61	Splash Proof Centrifugal Fan	φ175	69	48	1.3	62.4	3900	11.3	399	587	2.3	69	40000/60℃ (70000/40℃)	Pulse sensor	IP54	Yes	No
9W1TG48P0H61	Splash Proof Centrifugal Fan	φ175	69	48	0.65	31.2	3100	9	318	360	1.44	64	40000/60℃ (70000/40℃)	Pulse sensor	IP54	Yes	No
9W2TP24P0H001	Splash Proof Centrifugal Fan	φ221	71	24	3.35	80.4	3050	17.6	621	530	2.13	71.5	40000/60℃ (70000/40℃)	Pulse sensor	IP56	Yes	No
9W2TP48P0S001	Splash Proof Centrifugal Fan	φ221	71	48	2.3	110.4	3400	19.6	692	659	2.65	73.5	40000/60℃ (70000/40℃)	Pulse sensor	IP56	Yes	No
9W2TS48P0S001	Splash Proof Centrifugal Fan	φ225	99	48	2.45	117.6	3000	23.5	830	635	2.55	72	40000/60℃ (70000/40℃)	Pulse sensor	IP56	Yes	No
9B1W2TP24P0H001	Splash Proof Centrifugal Fan	270	99	24	3.35	80.4	3050	17.6	621	530	2.13	71.5	40000/60℃ (70000/40℃)	Pulse sensor	IP56	Yes	No
9B1W2TP48P0S001	Splash Proof Centrifugal Fan	270	99	48	2.3	110.4	3400	19.6	692	659	2.65	73.5	40000/60℃ (70000/40℃)	Pulse sensor	IP56	Yes	No
9B1W2TS48P0S001	Splash Proof Centrifugal Fan	270	119	48	2.45	117.6	3000	23.5	830	635	2.55	72	40000/60℃ (70000/40℃)	Pulse sensor	IP56	Yes	No
9W1TJ24P0H61	Splash Proof Centrifugal Fan	φ133	91	24	1.2	28.8	4150	6.39	225	395	1.59	61	40000/60℃ (70000/40℃)	Pulse sensor	IP54	Yes	No
9W1TJ48P0H61	Splash Proof Centrifugal Fan	φ133	91	48	0.55	26.4	4150	6.39	225	395	1.59	61	40000/60℃ (70000/40℃)	Pulse sensor	IP54	Yes	No
9W1TM48P4G01	Splash Proof Centrifugal Fan	φ100	25	48	0.36	17.28	7400	2.03	71.7	708	2.84	65	40000/60℃ (70000/40℃)	Pulse sensor	IP54	Yes	No