Negative Pressure Fiberglass Exhaust Fan for Coal Yard

Here is a rewritten and improved English version of the provided content, with added details to meet the 500-character minimum and make it more natural and human-like: --- **Product Specifications:** - **Model No.:** JL-148/128/110 - **Usage:** For Air Conditioner - **Cooling Method:** Direct Cooling - **Blades Material:** FRP (Fiberglass Reinforced Plastic) - **Voltage:** 380V - **Power:** 0.75kW - **Trademark:** JL - **Transport Package:** Seaworthy Packing - **Specification:** CE Certified - **Origin:** China - **HS Code:** 8414809090 **Product Features:** 1. **Efficient Airflow Design:** The fan features a well-engineered cone structure that ensures large air volume and low noise operation. 2. **High-Quality Bearings:** Imported bearings provide durability, reduce noise, and extend service life. 3. **Durable Shutter System:** Made from high-strength hot-galvanized steel, these shutters are resistant to oxidation, lightweight, and distortion-free. 4. **Strong Aluminum-Magnesium Alloy Wheel:** Offers high strength and long-lasting performance. 5. **Stainless Steel Blades:** Designed with a mirror finish and injection-molded for maximum airflow, no distortion or breakage. 6. **Energy-Efficient Motor:** Equipped with a CCC-certified motor, IP55 protection class, and F insulation rating for reliable performance. 7. **Maintenance-Free Design:** The cone part is designed as a horn, eliminating the need for belt replacements during maintenance. 8. **Rainproof Shutter System:** Utilizes forward airflow principles to prevent rainwater from entering the space without requiring electricity or manual control. **Working Principle of Negative Pressure Fan:** The negative pressure fan operates based on air convection and negative pressure ventilation principles. It is typically installed in areas with poor ventilation. When running, it quickly expels stagnant hot air, odors, and smoke through negative pressure. At the same time, fresh air is drawn in through doors and circulates, effectively improving air quality and cooling the environment. **Technical Parameters:** | Model Specifications | Diameter of Blades (mm) | Blade Rotational Speed (rpm) | Motor Rotational Speed (rpm) | Air Flow (m³/h) | Total Pressure (Pa) | Noise (dB) | Input Power (W) | Rated Voltage (V) | Height (mm) | Width (mm) | Thickness (mm) | |--------------------|--------------------------|-------------------------------|-------------------------------|------------------|---------------------|------------|------------------|-------------------|-------------|------------|----------------| | JLF-900 (30'') | 750 | 630 | 1400 | 22,000 | 65 | ≤ 65 | 370 | 380 | 900 | 900 | 930 | | JLF-1100 (40'') | 1000 | 600 | 1400 | 32,500 | 70 | ≤ 70 | 750 | 380 | 1100 | 1100 | 1150 | | JLF-1220 (44'') | 1100 | 460 | 1400 | 38,000 | 73 | ≤ 70 | 750 | 380 | 1220 | 1220 | 1200 | | JLF-1380 (50'') | 1250 | 439 | 1400 | 44,000 | 80 | ≤ 70 | 1100 | 380 | 1380 | 1380 | 1300 | **Product Images:**    This product is ideal for industrial and commercial applications where efficient ventilation and cooling are essential. Its robust design and advanced technology make it a reliable choice for any environment.

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