40x20 Cooling Fan (Computer Fan), DC axial fan

The 40x20 cooling fan is 20 mm thick on a 40 mm square frame; it mounts by 3.5 mm mounting holes 32 mm apart. Here as simplified STEP files.

How these parts are made, and what the levels mean: read the method

• Also searched as: 40x20 fan
• Model id: fans-dc-axial-40x20
• Standard: DC axial fan · size 40x20

Files

Part key	Simplified
fans-dc-axial-40x20	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
a	Frame side		40		40	nominal	L1
t	Frame thickness		20		20	nominal	L1
e	Mounting hole spacing		32		32	nominal	L1
dh	Mounting hole diameter		3.5		3.5	nominal	L1

Drawing

As a PDF: CC-DCFAN-SZ-40x20.pdf.

From the maker's data sheet

As written on the Mechatronics data sheet for this frame (mechatronics-dc-axial), one of the sheets this size's dimensions come from: the series, its models and features.

• Series: MR4020
• Models: MR4020L, MR4020M, MR4020H, MR4020E, MR4020X
• Operating Voltage: 12 or 24 VDC
• Bearing option: ball bearing or sleeve
• Construction: UL94V-0 plastic impeller and frame
• Air Flow: air exhaust over struts
• Features: soft start, polarity protection, auto-restart
• Options: tachometer output or locked rotor alarm signal; PWM speed control

The 40x20 cooling fan beside the 40x10 and the 40x28

The 40x20 is number 4 of the 18 DC axial fan cooling fans published here, listed from 25x10 to 120x38.

• Frame side (a): 40 mm on the 40x20 cooling fan, the same on the 40x10 and the 40x28.
• Frame thickness (t): 20 mm on the 40x20 cooling fan, against 10.3 mm on the 40x10 and 28 mm on the 40x28.
• Mounting hole spacing (e): 32 mm on the 40x20 cooling fan, the same on the 40x10 and the 40x28.
• Mounting hole diameter (dh): 3.5 mm on the 40x20 cooling fan, against 4.25 mm on the 40x10 and 3.5 mm on the 40x28.

Other sizes

• One size smaller: 40x10 Cooling Fan (Computer Fan), DC axial fan, 40 mm square, 10.3 mm thick.
• One size larger: 40x28 Cooling Fan (Computer Fan), DC axial fan, 40 mm square, 28 mm thick.

Documents

• CC-DCFAN-DS-40x20.pdf: 40x20 datasheet: values with levels, sources
• CC-DCFAN-SZ-40x20.pdf: 40x20 drawing: this size's values on the views
• parts.json: the part record of this size (the platform contract)

Sources

delta-dc-axial, mechatronics-dc-axial, sunon-dc-fan-255e. Full citations: the method page and this size's datasheet.

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