110V AC Axial Fan for Vacuum Packaging Machines: 92mm Case Study

What the machine builder needed

An OEM building commercial vacuum packing machines needed cooling for a batch of 500 units. Specifically, a 110V AC axial fan pulling heat off the internal motors and control electronics.

Space was tight. Consequently a 92 by 92mm frame with 82.5mm mounting centers was the most they could allow.

• At least 0.7 m3/min, or 24.72 CFM, against 25 Pa of system pressure.
• An ambient range from -20C to +55C, at both ends.
• ETL compliance, because the machines sell into North America.
• Lastly, a simple 2-wire connection for on/off running.

The customer also sent a rival datasheet as a baseline. Frankly, that is the most useful thing an enquiry can include, since it settles what equivalent actually means.

One line deserves early comment. The stated -20C limit sits below the standard part rating. The questions at the end explain how we settled that, rather than glossing over it.

Matching the AC axial fan to the duty point

Here the reference unit confirmed the target: a 92mm ball-bearing AC fan. From there, three decisions followed.

Bearings, decided by temperature

A sleeve bearing option exists in this frame size. Nevertheless we rejected it at once.

The reason is the low-temperature line. Sleeve bearing grease thickens as it cools, which causes start-up failures and cuts life. A dual ball bearing system, by contrast, behaves the same across a far wider range, and it carries a documented L10 life of 50,000 hours. On industrial machinery, uptime is what the customer really buys.

Motor type

A 110V supply with 2-wire on/off control points any AC axial fan straight at a shaded-pole induction motor.

We considered an EC motor from our SmartEC line, then dismissed it. Variable speed and higher efficiency have nowhere to go in a fixed-speed machine. Consequently adding them would only cost the OEM money.

Matching the duty point

This is where the real work sat. Our LWAA9225UH-16 carries a curve verified to AMCA 210/211. At 60Hz it makes roughly 24.5 Pa at 25 CFM.

Set that against the requirement of 24.72 CFM at 25 Pa. The match is almost exact. In short, that is the difference between a fan that works and a fan that merely fits.

The temperature question, answered honestly

We qualify the selected AC axial fan from -10C to +65C. That covers the +55C upper limit comfortably. However, it does not reach the stated -20C.

For an indoor industrial machine, -10C is genuinely sufficient, and the customer agreed. For a genuinely cold site, we build custom versions to -40C instead, and the questions below cover that route.

Finally, the fan uses UL-recognized components. Consequently the OEM has a documented path to the ETL certification their market requires.

Technical Specifications

Two frequency columns appear below. Note the 60Hz column runs faster yet draws less power, which surprises people the first time they meet an AC axial fan table.

Technical Documentation

The selected 92mm LWAA9225UH-16 AC fan with aluminum alloy frame.

LWAA9225UH-16-00.pdf
The complete technical datasheet contains performance curves (P-Q), mechanical drawings, and electrical specifications needed by a design engineer for system integration.

The initial OEM requirement was based on this third-party reference unit.

Customer Reference Specification
The document, provided by the customer, established the performance and dimensional baseline that procurement managers and engineers use to source and qualify alternative components.

Why a 500-unit order came here

On a 500-unit order, four things counted.

• A catalog match, found quickly. Rather than open an NPI cycle, our application engineers identified an existing verified model hitting 24.72 CFM at 25 Pa, and returned drawings and a quotation in days.
• The certification path de-risked. ETL was critical to the customer. Supplying a fan built with UL-recognized components, including UL1007 wire and Class A insulation, and designed to UL 507, gives them a clear route to approval on the finished machine.
• Low cost without a compromise. A standard AC axial fan built at our scale in Ningbo lands materially below comparable European-sourced fans, and it still carries the dual ball bearing system and the 50,000-hour design life.
• Consistency across all 500. We back performance with testing to AMCA 210/211 and ISO 5801. Meanwhile our ISO 9001 system is what makes the five hundredth fan behave like the first.

Browse our AC axial fan range, or the compact cooling fan section. The Intertek directory lists current ETL certifications.

Questions about certification and temperature

What life should we expect in continuous use?

Meanwhile the fan runs a high-precision dual ball bearing system, giving a designed L10 life of 50,000 hours continuous at a 40C ambient. On equipment like a vacuum packer, working long shifts where a failure means downtime, that durability is the point of specifying ball bearings at all.

We need ETL, and this fan carries UL components. Does that work?

Yes. The fan uses UL-recognized components, and we engineer it to UL 507. Both UL and ETL are nationally recognized testing laboratories authorised by OSHA, and an ETL mark certifies compliance with the same UL standards. We supply the component compliance documentation your final ETL listing needs.

Our specification says -20C but the datasheet says -10C. What now?

We qualify the standard model for reliable start-up and running down to -10C, which suited this indoor industrial machine. For a genuinely cold site, we build custom versions down to -40C using our ThermoFlex approach, with specialized bearing lubricants and motor materials, through a 90-day NPI project.

Why does the 60Hz column show more speed but less power?

Because a shaded-pole motor runs faster on 60Hz, while its impedance rises with frequency and limits the current. Consequently the fan spins faster yet moves slightly less air per revolution against the same load. It is a normal characteristic, not an error in the table.