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

The ideal cooling setup depends on your local climate and facility type:Negative Pressure System（Exhaust Fans + Cooling Pads）: Best for enclosed livestock barns（poultry, swine, dairy）and large greenhouse projects. The fans pull hot air out, creating negative pressure that draws fresh, cool air through the wet cooling pads.Positive Pressure System（Evaporative Air Coolers）: Best for open or semi-open factories, workshops, and commercial spaces. These units blow filtered, pressurized cool air directly into the space, forcing hot air out through open doors/windows.

For standard configurations, our average production lead time is 10 to 20 days after receiving your deposit. For large-scale project orders or customized requirements (such as special voltages or custom materials), it typically takes 25 to 30 days. We maintain a stable raw material inventory to expedite urgent project schedules when necessary—please coordinate with our sales team for urgent dispatch priorities.

We typically ship from major Chinese ports such as Qingdao, Shanghai, or Ningbo, which offer excellent global shipping schedules and competitive ocean freight rates. We offer flexible Incoterms including FOB, CFR, and CIF. If you have your own shipping forwarder in China, we will seamlessly coordinate the domestic logistics. If not, we can arrange reliable ocean freight directly to your designated destination port through our long-term partner shipping lines.

We provide a 1-year comprehensive warranty on all main components (including motors, fan blades, and structural frames) starting from the date of arrival at your port. If any component fails due to manufacturing defects during the warranty period, we will ship free replacement parts (such as motors, belts, or pulleys) immediately via international express (DHL/FedEx/UPS)

We offer two highly flexible packaging methods to optimize your ocean freight costs:Completely Knocked Down (CKD) / Semi-Knocked Down (SKD): Highly recommended for exhaust fans in bulk orders. We pack the frames, blades, and motors compactly. For example, a 40HQ container can hold up to 300+ sets of CKD fans compared to only about 80 sets of fully assembled fans, drastically lowering your shipping cost per unit.Assembled (Ready to Install): Recommended for smaller orders or if you lack local assembly labor. The units are shipped fully built on protective wooden pallets, wrapped in heavy-duty stretch film, and ready to plug in.

We have been in the ventilation and cooling equipment industry for over 18+ years, supplying clients in more than 30 countries.

Yes, samples are available. Sample cost and shipping are typically borne by the buyer, but we can deduct this from the bulk order if you proceed.

Standard delivery time is usually 10–30 days depending on the product and order quantity. Custom orders may take longer.

Yes, we can provide full documentation to facilitate smooth customs clearance, including invoice, packing list, and certificate of origin.

FRP Permanent Magnet Brushless Fan. Traditionally, pig farms predominantly used square hot-dip galvanized sheets, which typically rusted within a year, malfunctioned by the second, and required replacement by the third. We recommend the FRP Permanent Magnet Fan for several key reasons: First, its corrosion resistance provides a service life over 10 years longer than galvanized steel. Second, the motor meets Tier 1 energy efficiency standards, consuming only 60% to 70% of the power used by conventional motors. Third, the direct-drive system connects the motor directly to the blades, eliminating the need for belts and ensuring maintenance-free operation. Fourth, it features built-in phase-loss and locked-rotor protection to prevent motor burnout; unlike asynchronous motors, it does not require the additional installation of external frequency converters or protection devices.

Shandong Wanju Agricultural and Animal Husbandry Machinery Equipment Co., Ltd.  is located in Qingzhou, Weifang, Shandong, which is the premier origin for square exhaust fans and cooling pads. As a primary manufacturer of temperature control equipment for nearly 20 years, Wanju provides everything from standard galvanized sheet fans to high-end fiberglass and stainless steel models, as well as customized solutions. Beyond complete units, we maintain an extensive inventory of all components, including motors, fan blades, shutters, and even intelligent control boxes and automated feeding equipment.

Shandong Wanju Agricultural and Animal Husbandry Machinery Equipment Co., Ltd.   is a leading source manufacturer specializing in livestock farming and industrial cooling and ventilation equipment. Our core product line includes square negative pressure fans, fiberglass fans, and complete cooling and ventilation systems.

 We offer full support for OEM and ODM customization, allowing you to tailor external dimensions, voltage and frequency, motor configurations, and LOGO packaging to your specific requirements.

 Our standard motors are corrosion-resistant, low-noise, and provide high airflow, specifically engineered to withstand the high-humidity and dusty environments of farms while ensuring durability and low failure rates through rigorous factory testing.

We support sample trial orders as well as mass customization, maintaining sufficient stock to guarantee stable lead times.