LONGWELL Fans for 43,500 m³/h Agricultural & Commercial Ventilation

Customer Requirement

43,500 m³/h was the peak airflow requirement in a comprehensive technical inquiry received from a major system integrator. On May 21, 2026, the customer’s procurement lead submitted a request for technical documentation and pricing for 18 distinct product models, spanning a wide range of ventilation technologies. The scope of the request indicated the integrator was consolidating a bill of materials (BOM) for a large-scale, multi-faceted project, likely involving agricultural buildings, commercial facilities, and associated HVAC systems. This was not a request for a single component; it was a test of portfolio depth.

The product list was diverse and included:

• Heavy-Duty Agricultural Ventilation: A 380V, 1380mm belt-drive fan (LWPVE-1380T-01) capable of moving over 43,000 m³/h, intended for applications like poultry houses or large barns.
• Commercial Wall Exhaust Fans: Four models of AC-powered, shutter-integrated axial fans (LWEA4E…SM series) with impeller diameters from 350mm to 600mm, designed for direct air extraction from workshops, kitchens, or warehouses.
• Passive Roof Ventilators: Four sizes of wind-driven roof turbines (LWNPRF series) for powerless heat and moisture extraction.
• Standard Panel-Mount Fans: A range of AC axial fans from 6-inch to 12-inch (LWEA…S(U)M series) for general-purpose equipment cooling or enclosure ventilation.
• Light Commercial/Residential Fans: Three models of plastic-housed bathroom or window-style fans (LWEA…SP series), which also required a formal price quotation.
• Ancillary Components: 4-inch and 6-inch flexible aluminum ducting.

The core constraint was logistical. The customer needed a single, reliable supplier who could provide verified performance data, dimensional drawings, and competitive pricing for this entire list. Sourcing from multiple specialized vendors would create significant delays in their design phase and add complexity to their procurement process. They required immediate access to documentation compliant with standards like ISO 5801 to confirm system design choices.

Engineering Solution

Upon receipt, Longwell’s project management system categorized the inquiry as a ‘Light Development – Documentation & Quotation’ project. This classification is critical. It bypasses the 90-day NPI workflow for custom products and triggers a rapid-response protocol designed for procurement and engineering teams needing to validate standard components quickly. The Longwell project manager determined that no new engineering design was required; the challenge was one of efficient information retrieval and delivery.

An alternative approach for the customer would have been to contact multiple specialist manufacturers—one for large agricultural fans, another for commercial AC axial fans, a third for roof turbines. This path was rejected by the customer’s choice to engage Longwell for the entire list. It would have fragmented their supply chain, introduced potential compatibility issues, and multiplied their administrative workload. The engineering trade-off for the customer was clear: gain significant project velocity and procurement simplicity by partnering with a broad-portfolio manufacturer.

Technical Specifications

The following specifications are for the Longwell LWEA4E450SM-098, a representative AC wall-mount exhaust fan from the customer’s request, demonstrating the level of detail provided for each of the 18 models.

An airflow of 5,380 m³/h against 150 Pa of static pressure indicates this 450mm fan is engineered for real-world conditions, providing effective air exchange even with resistance from louvers, filters, or short duct runs.

Technical Documentation

The complete technical package delivered to the customer included the following verified documents. This enabled their engineering and procurement teams to finalize designs and issue purchase orders with confidence.

Commercial Wall-Mount Exhaust Fans

LWEA-SM series provides direct extraction for commercial spaces.

LWEA4E350SM-092 Spec Sheet (PDF): Mechanical drawing and performance data for the 350mm AC shutter fan.

LWEA4E450SM-098 Spec Sheet (PDF): Complete technical specifications for the 450mm AC shutter fan, used by engineers for system integration.

LWEA4E500SM-102 Spec Sheet (PDF): All necessary dimensional and electrical data for the 500mm AC shutter fan.

LWEA4E600SM-110 Spec Sheet (PDF): Technical data for the 600mm model, crucial for calculating air change rates in large spaces.

Agricultural & Heavy-Duty Fans

LWPVE-1380T-01 Spec Sheet (PDF): Data for the 1380mm high-volume agricultural fan, required for large-scale ventilation system design.

Standard Panel-Mount Axial Fans

The LWEA(S)UM series is a standard component for enclosure and general ventilation.

LWEA150(6″)SM-129 Spec Sheet (PDF): Technical data for the 6-inch AC panel fan.

LWEA200(8″)SM-130 Spec Sheet (PDF): Drawing and specs for the 8-inch AC panel fan.

LWEA250(10″)SM-131 Spec Sheet (PDF): Specifications for the 10-inch AC panel fan, used in control cabinets and machinery.

LWEA300(12″)SM-132 Spec Sheet (PDF): Performance curves and dimensions for the 12-inch AC panel fan.

Light Commercial & Ancillary Components

The LWEA-SP series is designed for light commercial and residential applications.

LWEA100(4″)SP-039 Spec Sheet (PDF): Data for the 4-inch plastic exhaust fan.

LWEA150(6″)SP-040 Spec Sheet (PDF): Specs for the 6-inch light-duty exhaust fan.

LWEA200(8″)SP-041 Spec Sheet (PDF): Information for the 8-inch light-duty exhaust fan.

Flexible ducting is a key accessory for many ventilation installations.

LW-AD4″-4000-01 Ducting Spec Sheet (PDF): Details for the 4-inch diameter flexible ducting.

LW-AD6″-4000-01 Ducting Spec Sheet (PDF): Details for the 6-inch diameter flexible ducting.

Powerless Roof Ventilators

LWNPRF100-01 Spec Sheet (PDF): Dimensions for the 100mm throat roof turbine.

LWNPRF125-01 Spec Sheet (PDF): Dimensions for the 125mm throat roof turbine.

LWNPRF150-01 Spec Sheet (PDF): Dimensions for the 150mm throat roof turbine.

LWNPRF300-01 Spec Sheet (PDF): Dimensions for the 300mm throat roof turbine.

Why Longwell for This Application

• Portfolio Breadth for Simplified Procurement: The integrator was able to source 18 different ventilation SKUs—from heavy agricultural fans to light-duty exhaust and passive turbines—from a single vendor. This consolidated their supply chain, reducing administrative overhead and simplifying logistics, turning days of procurement work into a single point of contact.
• 90-Day NPI New Product Introduction: LONGWELL offers the same 90-day NPI cycle that delivered the flagship case in §4 — structured, predictable, and validated across multiple top-tier customers.
• Cost Transparency and Competitive Advantage: By providing a quote for the new models alongside the technical data, Longwell gave the procurement manager all necessary information to make a swift decision. This was supported by Longwell’s typical 35-38% price advantage compared to sourcing similar components from European manufacturers, optimizing the project’s budget.
• Verified Performance for De-risked Design: Every specification provided is based on testing conducted to AMCA 210-16 and ISO 5801 standards. This gave the customer’s engineers high confidence that the specified performance, like the 5,380 m³/h of the LWEA4E450SM-098, would be met in the final application, mitigating project risk.

Explore our full Exhaust Fans range.

Frequently Asked Questions

Q: How long does it take to get technical drawings and a quote for a list of standard Longwell models?

A: For standard models in our catalog, technical data packages including drawings and spec sheets are typically delivered within 24-48 hours. 1-3 days for standard products, and 15 to 30 days for customized fans.

Q: Are all LONGWELL fans manufactured to the same quality standard?

A: Yes. All Longwell products, from the 1380mm LWPVE-1380T agricultural fan to the smaller LWEA series, are manufactured under our unified ISO 9001 quality management system. They also meet different global certification including CE, RoHS, WEEE, REACH, UL, and other required standards.

Q: The LWEA4E…SM series fans use AC motors. Do you offer higher-efficiency EC motor equivalents?

A: Yes, most of our AC axial fan lines have direct EC motor drop-in replacements. An EC version will offer a 30-40% increase in energy efficiency and add smart control capabilities via our SmartEC™ platform (0-10V/PWM/RS485).

Project Item: 6996030365
Project Date: 2026-05-21 07:44:50