Invisible Design, Comfort Without Distraction | LWCE-100 Trench Heater Application Case
“Good design is invisible.Good HVAC is inaudible.”
In modern architectural aesthetics, floor-to-ceiling glass curtain walls grant spaces infinite transparency. However, to combat the cold drafts and condensation near windows, we are often forced to compromise—by stuffing noisy heaters beneath the floor.
When the 3 PM sunlight spills into a boardroom, or when a guest reads quietly in the lobby of a five-star hotel, a sudden hum of electricity or wind noise is enough to shatter the elegance.
This is why LONGWELL has rethought the essence of airflow.
We don’t want to make annoying noise; we want to create a quieter breeze.
01 Redefining the Standard of “Quiet”
Most fan manufacturers talk about Decibels (dB); we talk about Sound Quality.
The LWCE-100 Series is not just an EC cross-flow fan; it is our tribute to aerodynamics.
● Rejecting Resonance
We discarded cheap plastics and adopted high-rigidity aluminum alloy impellers for the entire series. Even under the intense heat of trench heating, it remains steadfast, maintaining micron-level dynamic balance (G6.3 standard).
No deformation means no vibration.
● The Art of Laminar Flow
Traditional axial fans seem to “churn” the air, while LWCE’s cross-flow design “combs” it. The wind it blows is like a uniform and continuous wall, gently covering the glass surface, cutting off cold bridges without introducing a hint of turbulent noise.
In 30% low-speed cruise mode, operating noise is as low as 20 dB(A).
This is quieter than a library at midnight.
02 Smart “Core”, Green Lung
If silence is its cultivation, then EC Technology is its wisdom.
In an era pursuing not just comfort but also carbon neutrality, traditional AC shaded-pole motors are relics of the past. The LWCE series features LONGWELL’s proprietary EC (Electronically Commutated) Smart Chip.
· 0-10V Stepless Speed Control: Unlike traditional fans with rigid “High/Med/Low” settings, it understands instructions from Building Management Systems (BMS). With a temp difference of just 0.5°C, it delivers a gentle breeze; when a cold snap hits, it instantly unleashes powerful heat.
· 80% Efficiency Jump: Compared to traditional motors, it saves up to 70%-80% in electricity. For a large commercial complex with hundreds of vents, this isn’t just an eco-slogan; it’s tens of thousands in annual operational savings.
03 Real Case: When Four Seasons Met Longwell
📍 Location: Executive Lounge of a world-renowned luxury hotel
⚠️ Challenge: Despite a stunning 270° river view, guests near the windows often complained of cold drafts at their ankles. The original trench heaters were so noisy (>45dB) that complaints frequently forced staff to turn them off, rendering the heating useless.
LONGWELL’s Answer:
We replaced the original AC fans with LWCE-100520SN-06 (EC Cross Flow Fans).
✅ Noise Eliminated
Even at full heating speed, the fan sound is completely masked by background music. Guests aren’t even aware that equipment is running beneath the floor.
✅ Constant Temperature
Paired with PID temperature control, the fans no longer start and stop frequently. Instead, they maintain a low-speed constant flow, bidding farewell to hot-and-cold fluctuations near the windows.
✅ Worry-Free Maintenance
The hotel’s engineering manager reported that thanks to NSK ball bearings and the low-temperature characteristics of EC motors, there have been zero failures in the two years since the retrofit, eliminating the need to lift heavy floor grilles for repairs.
Return Silence to the Space
In this noisy world, “being undisturbed” is the ultimate luxury.
The LONGWELL LWCE (EC Fan) Series was born for places extremely sensitive to sound—libraries, theaters, high-end residences, and recording studios.
We manufacture fans, but what we deliver is Silence.
Ningbo Longwell Electric Technology Co., Ltd.
Born for high-quality breathing, Longwell fans complete your machine.
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