Shandong Wanju Agricultural and Animal Husbandry Machinery Equipment Co., Ltd.

Wanju cooling pad products are made of specialized paper honeycomb structured material, utilizing a new generation of polymer materials and spatial cross-linking technology to achieve high water absorption, high water resistance, anti-mold properties, and a long service life. The large evaporation surface area provides a cooling efficiency of over 80%. The cooling pads contain no surface-active agents, allowing for natural water absorption, rapid diffusion, and long-lasting effectiveness; a single drop of water can fully diffuse within 4-5 seconds. The natural water suction height reaches 60-70mm per 5 minutes and 200mm per hour, fully meeting international industry standards. Furthermore, the cooling pads are free of phenol and other chemicals that cause skin allergies, making them safe, green, energy-saving, and eco-friendly for installation and use. Cooling pad paper comes in various specifications and dimensions, primarily involving thickness, flute height, and honeycomb pore size. Common classifications by flute height include 7mm, 6mm, and 5mm, and by flute angle include 60° and 90°, resulting in specifications such as 7090, 7060, 6090, and 5090. Thickness options typically include 100mm, 150mm, and 200mm.

Wanju is a leading source manufacturer of industrial fans with years of mature international export experience and independent import-export rights, deeply serving overseas markets across Southeast Asia, Central Asia, Europe, and South America. We are highly familiar with global customs clearance standards, voltage adaptation, and the full process of maritime customs declaration, supporting both OEM and ODM customization. We provide a one-stop service covering product compliance, documentation, reinforced packaging, and overseas logistics delivery. Our export orders feature stable lead times and controlled quality. We can provide overseas cooperation cases and export certification documents. We welcome you to consult with us, request samples, or visit our factory for inspection.

You can contact us directly with your specific requirements to obtain accurate MOQ information. For standard exhaust fans without customization, Wanju's MOQ is typically 50 units. For customized fans (such as those with special dimensions, airflow, materials, or explosion-proof functions), the MOQ is usually higher, generally starting at 100 units or more, as custom production requires adjustments to molds and manufacturing processes. For high-end or specialty fans, such as those for industrial use or specialized sectors (chemical, pharmaceutical, nuclear power), the MOQ may reach 200 units or more due to high technical complexity and quality control requirements. We also offer flexibility in adjusting MOQs based on customer cooperation history, purchase scale, or market conditions.

Wanju specializes in the production and supply of industrial fans, maintaining a year-round stock of products including workshop and livestock cooling fans, corrosion-resistant fiberglass fans, evaporative cooling pads, air coolers, and ventilation windows. Our factory has its own warehouse, with all standard models readily available. We can fulfill urgent orders, project orders, and export full container orders. We also support customization, OEM, and dropshipping. Quality is guaranteed, and delivery times are stable. We welcome long-term cooperation from factories, projects, and distributors.

If you are looking for a Chinese factory that specializes in ventilation for high-ammonia environments (such as poultry or swine houses), Wanju Ventilation is your ideal partner.

Unlike general fan suppliers, we understand that "Ammonia Resistance" is more than just a material choice—it is an engineering standard. Here is how we ensure your equipment lasts 10+ years:

Our fans are made entirely of 304 stainless steel, from the outer frame, drop hammer mechanism, and louvers to every screw and rivet, completely eliminating system failures caused by rust on small parts.

Sealed High-Protection Motors: Our motors are specially designed for livestock environments, preventing ammonia gas from corroding the internal copper windings.

Accurate Thickness Guarantee:

"We strictly adhere to the 304 standard, ensuring a true thickness gauge. We never use 201 to imitate it. You can verify the thickness at any time using N8 solution or a spectrometer."

Rust prevention for the cooling pad frames in coastal pig barns requires a comprehensive approach involving material selection, surface treatment, and routine maintenance.

1. Material Selection:

Stainless Steel: Possesses strong resistance to salt spray corrosion, making it suitable for high-salinity coastal environments.

Aluminum Alloy: Naturally forms a protective aluminum oxide film on its surface; offers good corrosion resistance, is lightweight, and features high structural strength, making it ideal for humid environments.

Galvanized Steel: The zinc coating acts as a barrier, isolating the steel substrate from corrosive agents; however, it is essential to ensure that the zinc layer is of sufficient thickness (e.g., a double-sided coating weight of ≥140 g/m²).

2. Surface Treatment:

Rust Removal and Cleaning: Periodically remove surface rust using sandpaper or a wire brush, then wipe the surface clean with a cloth to ensure it is free of grease and dust.

Application of Protective Coatings: For rust prevention, utilize a multi-layer coating system consisting of an epoxy zinc-rich primer, an epoxy micaceous iron oxide intermediate coat, and a polyurethane topcoat. The dry film thickness should be 60–80 μm for the primer and approximately 100 μm for the intermediate coat. Alternatively, apply rust-inhibiting oil to the metal surface to form an oil film that isolates the material from air and moisture; this method is suitable for temporary protection or for areas that are difficult to paint.

3. Sealing and Waterproofing:

Inspect Sealing Strips: Conduct monthly inspections of the sealing strips located between the water curtain frame, the barn wall, and the water curtain pads. Promptly replace any strips that show signs of aging or damage to prevent humid air from infiltrating the structure.

Seal Connection Points: Apply sealant to frame joints, bolt holes, and other connection points to prevent moisture accumulation.

4. Routine Maintenance:

Regular Cleaning: Weekly, use a soft cloth or a low-pressure water sprayer to remove dust and debris from the surface of the water curtain frame, thereby preventing the accumulation of contaminants that can lead to corrosion.

Check Drainage: Ensure that the drainage holes in the water curtain frame remain unobstructed to prevent water stagnation, which can cause metal corrosion.

Control Environmental Humidity: In instances of excessive humidity, utilize dehumidification equipment to lower the ambient moisture level and mitigate the risk of corrosion.

By implementing the measures outlined above, it is possible to effectively delay the onset of rust on the Evaporative Cooling Pad frames in coastal pig barns and extend their overall service life.

From a cost perspective, importing goods in the form of disassembled kits (CKD/SKD—Completely Knocked Down or Semi-Knocked Down) for local assembly is typically more cost-effective than directly importing fully assembled units. However, if your project requires only a very small quantity—such as 1 to 5 units—for sampling or supplementary purposes, or if the project site completely lacks the necessary assembly infrastructure (i.e., no personnel, tools, or workspace), then, for the sake of convenience and to meet tight deadlines, one may have no choice but to accept the burden of paying higher import duties.

Taking Vietnam—one of the Southeast Asian markets served by Wanju—as an example: when we first entered the Vietnamese market, our collaboration with a client began with a single full container load of square exhaust fans.

Our equipment successfully passed the test of real-world operating conditions in Vietnam. More importantly, we helped our client achieve lower operating costs, faster after-sales response times, smoother import customs clearance, and a durable product design tailored to the local climate—these are the true reasons behind their continued repeat business. Just two months after the delivery of the initial batch, the client confirmed a follow-up order.

To date, we have established long-term cooperative relationships with enterprises across various markets, including Southeast Asia, Central Asia, and Bangladesh.