Custom 2300 RPM Cross-Flow Fan for 2300W Air Curtain Heaters

Customer Requirement

An OEM was developing a new commercial air heater, the type that hangs over a doorway or hides inside a fan heater, pushing a wide, even sheet of warm air across a room. Behind it sat a 2,300 W heating element, and the supply was fixed at 220 V / 50 Hz.

They came with drawings and a reference point, which beats a blank page every time: our existing LWCA-65300S-10 cross-flow fan.

Engineering Solution

The motor came first. Jumping from 1,800 to 2,300 RPM is a 28% increase in speed, and at 220 V / 50 Hz no off-the-shelf motor hit that operating point. So our engineers designed a new winding configuration, tuned so the motor lands on 2,300 RPM at the customer’s supply voltage. Input power rose from 40 W to 50 W as a direct consequence.

Higher speed put a different question on the table: bearings. Running faster — and pushing air that’s just come off a hot coil — is hard on them. We swapped the standard sleeve bearings for ball bearings.

The smartest part of the project was what we didn’t change. The Ø64.5 mm impeller and the housing came straight from existing tooling — no new molds, no new NPI costs, no re-qualification of the aerodynamics.

Technical Specifications

The specifications confirm a matched 220V sub-assembly. The 50W fan provides the necessary airflow for the 2300W heating element, creating a complete thermal management system ready for integration into an OEM’s final product.

Technical Documentation

LWCA-65300SN-11-00.pdf
This mechanical drawing provides the complete dimensional and electrical specifications for the modified 2300 RPM cross-flow fan, required by design engineers for chassis integration.

LWHW-AC65300S-11.pdf
This document details the 2300W heating element’s specifications, including power rating and dimensions, critical for thermal modeling and assembly planning.

This image shows the base AC motor from the standard LWCA-65300S-10 fan, which served as the platform for this rapid customization project.

Why Longwell for This Application

• Rapid OEM Customization: From request for quotation to approved drawings for both the fan and the heater took under 72 hours. The 90-day NPI process makes the customization quicker and efficient.
• Integrated Thermal Sub-Assembly: We delivered the air mover (LWCA-65300SN-11-00) and the heating element (LWHW-AC65300S-11) as a validated pair. One order, one vendor, one set of drawings — the customer doesn’t have to reconcile two suppliers’ tolerances
• Cost-Effective Performance Upgrade: We reworked the winding of an existing AC fan platform instead of starting from a blank sheet. The customer got 28% more speed for a marginal bump in component cost — performance comparable to a full custom development, at 35–38% less than a European competitor would quote for the same result.
• Production-Ready Engineering Data: The customer received not just a price, but complete technical schematics and part numbers ready for immediate integration into their bill of materials and assembly procedures. This also helps for the later mass production.

Explore our full Cross-Flow Fans range.

Frequently Asked Questions

Q: What is the typical lead time for a sample order of 5 units for this modified fan?

A: Following the drawing approval, which took less than three days, the production of a 5-unit sample batch is typically completed within 2-3 weeks.

Q: Can this fan assembly be controlled for variable speed?

A: Not in the version we specified. The LWCA-65300SN-11-00 uses a fixed-speed AC motor tuned to run at 2,300 RPM on a 50 Hz supply. If you need variable speed, we’d propose an equivalent fan built around an EC motor with our SmartEC™ controller, accepting standard 0–10 V or PWM signals.

Q: The heating element is 2300W. What is the expected temperature rise of the air?

A: The exact temperature rise (ΔT) is a function of the final mass airflow rate, which depends on the static pressure within the customer’s specific air heater enclosure. For reference, the fan’s motor draws 50 W at 2,300 RPM in free air. Send us your system impedance curve, and we’ll run the test per AMCA 210-16 in our lab to pin down the operating point and calculate the real air temperature rise for your enclosure.

Project Item: 7054636064-LWCA-65300S-10
Project Date: 2026-07-21 06:40:31