ADH-K900 Heavy-Duty Belt-Drive Blower for 30 kW Industrial Retrofits

Customer Requirement

A 30 kW motor specification defined the core of this engineering request. The client, a system integrator for large-scale industrial ventilation, needed a single blower assembly to pair with their existing motor infrastructure. Their request was for one Longwell ADH-K900 unit, but supplied without a motor. This is a common requirement in retrofit projects or for OEMs standardizing on a specific motor supplier. The hard constraints were clear. The delivered unit had to include the impeller, the scroll housing (volute), and the complete bearing and axle assembly, ready to accept a V-belt drive system. The client needed detailed engineering drawings that explicitly marked all included components to facilitate their system design and integration. The specified permissible media temperature range of -20°C to +85°C suggested a demanding industrial environment, possibly for factory air exchange or process exhaust, but not extreme flue gas. Based on the ADH series’ typical application in large-volume, low-pressure scenarios, the client was likely designing a system needing high airflow, exceeding 100,000 m³/h, where a forward-curved blade design is optimal. The request for a single, un-motorized unit also signaled that the client was testing Longwell’s mechanical build quality and documentation support before committing to a larger order.

Engineering Solution

The request to pair with an external 30 kW motor immediately dictated a belt-driven solution. This made the ADH (Advanced Duty, Heavy) series the correct product family. A direct-drive EC fan, like our REM or TEM series, would have an integrated motor and was therefore unsuitable. The customer had pre-selected the ADH-K900 model. Our engineering review confirmed this was the appropriate choice. The ADH-K900 is specifically rated for a nominal motor power of 30 kW, ensuring a perfect match without oversizing or undersizing the core mechanical components. The primary engineering decision validated was the choice of a forward-curved impeller (ADH series) over a backward-inclined one (RDH series). The ADH design is engineered for maximum airflow volume at low to moderate static pressures, fitting large industrial ventilation. If the client’s application had required operating pressures above 2,000 Pa, for dust collection mains or high-resistance filtration, the RDH series would have been the recommended alternative. For this high-airflow requirement, the ADH-K900 was correct. Component selection focused on durability. The unit is built with a heavy-duty welded steel housing and a forward-curved, multi-blade impeller made of galvanized steel. The critical component for a belt-drive application is the bearing assembly. The ADH-K900 is equipped with a robust bearing housing designed for a permissible load of 3000 N, and its 60 mm diameter axle (g6 tolerance) is engineered to handle the torque from a 30 kW motor without deflection. The final deliverable was the ADH 900-K.pdf drawing, which passed technical review and was archived before confirmation with the sales team.

Technical Specifications

The ADH-K900 is a belt-driven centrifugal blower designed for heavy-duty industrial applications requiring high airflow volume. The specifications below are based on the unit being paired with a 30 kW motor to achieve its maximum performance potential.

The massive 170,600 m³/h airflow capacity defines this as a unit for large-space ventilation. Its 306 kg weight underscores the heavy-duty construction necessary for industrial reliability.

Technical Documentation

This is the primary engineering drawing for the ADH 900-K belt-driven blower assembly, detailing all mechanical dimensions and components for system integrators.
Download ADH 900-K Engineering Drawing (PDF)

This image specifies the key performance limits of the ADH-K900, including maximum airflow, pressure, and thermal operating range, essential for application engineers.

This document provides the full dimensional table for the ADH-K series, allowing procurement managers and designers to cross-reference different sizes.

Why Longwell for This Application

• OEM Supply Flexibility: This project highlights Longwell’s capability to supply ‘bare’ blower units without motors. This allows OEMs and integrators to standardize on their preferred motor brand or use existing inventory, reducing total system cost and simplifying maintenance.
• Drop-in Replacement Efficiency: The ADH series is dimensionally and aerodynamically aligned with common European models like the Nicotra Gebhardt ADH range. This provides a direct, cost-effective replacement path, offering a 35-38% lower price point without requiring any system redesign.
• Rapid Engineering Support: The initial request was for a drawing. Longwell’s mature internal process, moving from ‘Sales Input’ to a reviewed, approved, and archived drawing, demonstrates an ability to provide critical engineering data quickly, accelerating the customer’s design and approval cycles.
• Verified Industrial Grade: The ADH series is not a light commercial fan. It is a core part of our industrial portfolio, engineered for applications where failure is not acceptable. The 306 kg unit weight, 3000 N bearing load capacity, and all-steel construction provide the necessary durability for a high-torque 30 kW belt-drive system.

Explore our full Commercial Blowers range.

Frequently Asked Questions

Q: What is the required V-belt and pulley specification for the ADH-K900 when paired with a 30 kW motor?

A: Final pulley selection depends on the motor’s native speed and shaft diameter. The ADH-K900 has a 60 mm diameter axle with a standard 17×22 mm keyway. To achieve the maximum rated fan speed of 650 RPM with a common 4-pole (1450 RPM) motor, a pulley ratio of approximately 2.23:1 is required. Our application engineers can confirm the precise pulley and belt specification for your chosen motor.

Q: Does the standard ADH-K900 support ATEX environments?

A: No, the standard model shown here is for general industrial ventilation. However, the ADH series does have ATEX-certified versions available for hazardous environments. These ATEX variants, certified for zones like II 3G or II 3D, feature non-sparking components and other safety modifications. This follows our 90-day custom NPI cycle, a process 60-70% faster than the European standard of 12-18 months.

Q: Can the ADH-K900 handle air with high temperatures or particulate matter?

A: The standard model is rated for media temperatures up to +85°C. For applications with higher temperatures, such as flue gas up to +200°C, we recommend the RDH High-Temp series. While the ADH can handle ambient air, it is not designed for heavy particulate loads; our RDH series with its backward-inclined, self-cleaning blade design is the correct choice for dust collection systems.

Project Gallery & Technical Drawings

Project Item: 6993923854-ADH-K900 只要一台 包含叶轮 蜗壳 轴承等一整套，不带电机 需要图纸
Project Date: 2026-05-18 07:08:52