Identify your fan

About 10–15 minutes

Before you start

If you follow these instructions, we can identify every detail of your fan and supply the correct parts. Skip anything you can't measure. A clear photo is often enough for us to fill the gap.

Have these ready

Tape measure for diameter and blade width.
Calipers or a ruler for shaft, keyway and bolt holes.
Phone camera. Wipe dirt off the blade root first so stamped markings show.
Lock out the equipment. Never measure a fan that can start.

Measurement units (pick one)

Inches Millimeters

Is the fan off the equipment? (pick one)

Removed Still installed

Either works. Some mounting details are easier with the fan off.

Is there an identification sticker or tag on the fan? (pick one)

Multiwing ASMStarts with ASM Wing Fan codeBlade type, size… Other numberEquipment maker's part no. None found

Check the hub, the center boss and the blades, on both sides of the fan.

ASM numberCopy every character, including all the zeros.

Code exactly as printed

Please keep measuring. A tag helps a lot, but some numbers belong to an equipment maker's private spec that the manufacturer won't release. Your measurements make sure we can still match the fan.

Equipment model or old invoice Optional.

Why the part number isn't enough. Blades are molded full length, then trimmed to fit each machine. The name molded on your blade (5ZL, 6WR…) identifies the blade profile, not your fan's size, and it stays the same after trimming. The same blade also makes a different diameter on a different hub. To cut new blades that match yours, we need your fan's measured diameter and hub positions.

An uncut 5ZL blade, full length as molded.

Multiwing 5ZL name molded into a blade — Its molded name, which stays the same after the blade is cut.

Identify your fan even if you don't see it in our store. We list the common parts, but we can special-order the rest of the Multiwing and Wing Fan ranges.

Each step has a photo box. Photos are resized on your device before sending, so large phone pictures are fine. You can send with steps left blank.

Step 1 of 7

Diameter

This is the most important measurement. It tells us where to trim your new blades. Measure your fan as it is, not a catalog length. If a blade is broken, measure from an intact one. Method 1 needs an even number of blades. Methods 2 and 3 work on any fan.

How will you measure? (pick one)

1 · Tip to tipStraight line through the center, blade tip to opposite blade tip. 2 · Tip to center × 2Blade tip to the center of the hub. 3 · Hub + 2 bladesHub diameter plus two blade lengths.

Tip-to-tip measurement

in

Tip-to-center measurement

in

Hub diameter

in

One blade length

in

Tip to just above the root.

Measure to the outermost point of the blade tips.

Tape measure hooked on a blade tip, read at the hub — Method 3 blade length: hook the tape on the blade tip and read where the blade meets the hub.

Steps 2 & 3 of 7

Blade count and hub positions

Count the blades. Then count every socket in the hub, including any filled with a spacer instead of a blade. A 12-position hub with 6 blades is a different fan from a 6-position hub with 6 blades. The hub size changes the diameter the blades reach, so it changes where we trim.

Number of blades

Total hub positions

Hub outside diameter

in

Optional. Across the round hub plate, not counting the blades.

Are all blades the same? (pick one)

Yes No, mixed Not sure

Enter counts to preview the hub layout.

Twelve-position Multiwing hub — A 12-position hub. Count every socket, including any that hold a spacer.

Step 4 of 7

Blade series

The series is set by the shape of the blade root, the part that clamps into the hub. The blade name is often molded into the blade. If you can't read it, measure blade width across the base just above the root and we'll narrow it down.

Which blade series is it? (pick one)

Blade width at the base, just above the root

in

Brand molded on the blade (pick one)

Multiwing Wing Fan Not sure

Wing Fan names usually start with P or S, like P4ZL or S2ZR.

Blade name as stampedType every character you see. L or R is the blade hand. The name doesn't change when a blade is trimmed, so it won't tell us your length.

Multiwing 7ZR molded name — Multiwing 7ZR

Multiwing 6WR molded name — Multiwing 6WR

Wing Fan S2ZR molded name — Wing Fan S2ZR

Most blade names are on the concave side of the blade base.

Measure straight across the blade base, just above where it enters the root.

Ruler across the base of an S2ZR blade — Measuring blade width straight across the base, just above the root.

Step 5 of 7

Pitch angle and rotation

Where the pitch is marked depends on the blade series. Choose a series in the previous step for specific directions.

Pitch angle

deg

I can't read the pitch marking

Rotation (pick one)

Clockwise Counter-clockwise Not sure

Viewed from (pick one)

Air intake side Air discharge side

Rotation only means something with the viewing side. The discharge side is where the air blows out.

Step 6 of 7

Blade material

Plastic blades carry a small molded dial near the base of the blade that names the material. Aluminum blades are the only ones with no material marking. Colors vary on older blades and custom orders, so trust the dial over the color.

Which material does the dial show? (pick one)

Highest air temperature the fan sees

°F

Optional. Helps us confirm the material suits the job.

Row of Multiwing blades in several sizes, natural and black — Blades come in natural, gray and black. The molded dial names the material, not the color.

Step 7 of 7

Mounting

How does the fan attach to the shaft or engine? Pick one and fill in what you can.

Almost done

Your equipment and what you need

This tells us whether you need an exact replacement, new blades for your existing hub, or a repair and rebalance.

Last step

Your contact details

We reply by email or phone, usually within one business day.

Name *

Company

Email *

Phone

Ship-to city, state / ZIP

Best way to reach you

How did you find us?

Review

Request sent

Thanks. We have your fan details and photos and will get back to you shortly.

Identify your fan

Before you start

Have these ready

Diameter

Blade count and hub positions

Blade series

Pitch angle and rotation

Blade material

Mounting

Straight bore details

Bushing details

Flange details

Your equipment and what you need

Your contact details

Review

Request sent