The D3.6E6 indoor refrigeration unit is specifically designed for medium-and-low temperature cold storage environments, delivering optimal performance at a standard room temperature of -18°C. Driven by a single 400 mm high-capacity external rotor fan, this ceiling-mounted evaporator provides an extensive air volume of 3900 m³/h with an 10-meter air throw. It serves as an excellent indoor refrigeration unit choice for small-to-medium cold storage facilities, commercial kitchens, and supermarket back-room freezers looking for rapid temperature pulldowns.

To maintain rigid sub-zero storage thresholds efficiently, the internal heat exchanger layout is structurally optimized. The core of this indoor refrigeration unit is fitted with advanced inner-grooved copper tubes arranged in a staggered pattern, maximizing internal surface contact and minimizing oil film thermal resistance. These lines are mechanically expanded into double-sine wave aluminum fins with a 6.0 mm (4 FPI) fin pitch and open-window contours, which significantly delays frost accumulation while amplifying heat transfer speeds.

Constructed to withstand continuous high-humidity freezing conditions, the casing consists of premium prepainted steel plates and aluminum structural tube sheets for excellent rust resistance. The D3.6E6 indoor refrigeration unit incorporates an intelligent electric defrost system utilizing specialized stainless steel heating elements placed through the coil block and independently in the condensation drainage pan to guarantee quick, complete ice clearance. For absolute field safety, every unit passes a meticulous 2.8 MPa factory clean air pressure test.

Ruifujie stands as an industry-leading manufacturing enterprise specializing in commercial and industrial refrigeration engineering, backed by over two decades of technical expertise. Our production facility develops high-precision refrigeration compressors—including advanced scroll, screw, and semi-hermetic piston designs—alongside heavy-duty walk-in cold storage systems, blast freezers, and automated ice plants. Driven by rigorous quality standards and professional manufacturing lines, we offer full-tier OEM/ODM design flexibility to align with specialized corporate configurations worldwide. Backed by dependable system stability and excellent cost-efficiency, Ruifujie cooling equipment is actively exported to global markets, including the United Arab Emirates, the United Kingdom, and Saudi Arabia.

A1: The 6.0 mm fin pitch is specifically engineered for low-temperature applications. It offers a balanced compromise between physical surface area and clearance space, effectively preventing early frost bridging between the fins to maintain constant airflow during long operation windows.

A2: Every heating tube features a stainless steel jacket sealed with high-grade ultra-low temperature epoxy resin leads and specialized insulated terminal joints. This blocks any moisture from penetrating the heating elements during the defrost phase.

A3: The standard Class F IP55 external rotor motor operates at fixed industrial voltages, but it is fully compatible with approved external frequency inverters or electronic fan speed controllers if your project demands modulated airflow.

A4: All units are crated in export-grade wooden cases. For CIF/CIP shipping terms, we purchase comprehensive marine transport insurance; for FOB/EXW terms, we assist your nominated freight forwarder with strict handling protocols.

A5: Yes. The 2.8 MPa test pressure ensures the internal coils can seamlessly handle modern alternative refrigerants like R448A or R449A, provided your external expansion valve is matched to the corresponding fluid properties.