Fortinet FortiSwitch AX9004G Fan Module

Hot-swappable fan module for the FortiSwitch AX9004G four-slot chassis. Three are required for normal operation, whatever combination of supervisor modules and line cards is installed. Front-to-back airflow, replaceable without taking the chassis down.

KEY SPECS
TypeHot-swappable fan module
FitsFS-AX9004G chassis
Quantity required3
Air flowFront to back
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Fortinet FortiSwitch AX9004G Fan Module (FS-AX9004G-FAN)Fortinet Select Partner
BEST SELLERS

Most popular FortiSwitch AX9004G Fan Module configurations

The configurations most customers buy. The complete catalog is further down.

Hardware

Brand-new, sealed · ships same / next business day · price shown live in your selected currency.

FortiCare support

Available by quote — ask us for pricing.

FortiCare and subscriptions delivered electronically worldwide · prices shown live in your selected currency · add-to-cart enabled when in stock.

OVERVIEW

What the FortiSwitch AX9004G Fan Module is for

The FS-AX9004G-FAN is the cooling module for the FortiSwitch AX9004G four-slot chassis. Fortinet requires three fan modules for normal operation regardless of the number and combination of supervisor modules and line cards installed — this is not scaled to the load, so even a lightly populated chassis needs all three.

The modules are hot swappable, so a failed unit can be replaced while the chassis stays in service. Airflow through the AX9004G is front to back, and the chassis dissipates up to 18,000 BTU/h at maximum configuration, which is worth planning for in rack and room cooling.

This module fits the four-slot AX9004G only. The eight-slot FS-AX9008G uses its own fan module, FS-AX9008G-FAN — the two are not interchangeable. Power supplies, by contrast, are shared between both chassis.

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WHICH MODEL IS RIGHT

Is the FortiSwitch AX9004G Fan Module right for you?

A quick guide to choosing the right AX9000G component.

Fan moduleFitsHot swap
FS-AX9004G-FANFS-AX9004G (4-slot)Hot swappableViewing
FS-AX9008G-FANFS-AX9008G (8-slot)Hot swappableView →

Fan modules are chassis specific and are not interchangeable between the two chassis.

SPECIFICATIONS

FortiSwitch AX9004G Fan Module specifications

TypeHot-swappable fan module
Chassis compatibilityFS-AX9004G only (the FS-AX9008G uses FS-AX9008G-FAN)
Quantity required3 per chassis, regardless of supervisor and line-card count
Air flowFront to back
Hot swapYes — replace without taking the chassis out of service
Chassis heat dissipationUp to 18,000 BTU/h at maximum configuration
Chassis noise level75 dB measured at 25°C
Chassis operating temperature0°C to 40°C

Source: official Fortinet FortiSwitch-AX9000G Series datasheet, December 2025.

USE CASES

Where it fits

Three required, always
Fortinet mandates three modules whatever the card count.
Hot swappable
Replace a failed unit with the chassis still in service.
Front-to-back airflow
Matches standard hot-aisle / cold-aisle containment.
Keep a spare
A cheap module against an outage on an expensive chassis.
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How it compares

The AX9000G family

Every part of the AX9000G family is ordered separately, so it is worth checking what fits where before you buy.

Fan moduleFitsHot swap
FS-AX9004G-FANFS-AX9004G (4-slot)Hot swappableViewing
FS-AX9008G-FANFS-AX9008G (8-slot)Hot swappableView →

Fan modules are chassis specific and are not interchangeable between the two chassis.

COMPARE THE LINEUP

Where it sits in the AX9000G range

The AX9000G family is two chassis, one supervisor module and five line cards, plus fan modules and power supplies. Everything is hot swappable.

The AX9000G chassis family and the parts that go in it.

FortiSwitch AX9004G
Slots4
SupervisorsUp to 2
View the FortiSwitch AX9004G →
FortiSwitch AX9008G
Slots8
SupervisorsUp to 2
View the FortiSwitch AX9008G →
AX9000G-SUP
RoleSupervisor
Per chassis1–2
View the AX9000G-SUP →
AX9000G-LC10P
Ports48× RJ45 + 2× SFP+
Speeds1/2.5/5/10 GE
View the AX9000G-LC10P →
AX9000G-LC10S
Ports48× SFP+ + 2× SFP+
Speeds1/10 GE
View the AX9000G-LC10S →
AX9000G-LC25
Ports48× SFP28 + 4× QSFP28
Speeds10/25 GE + 40/100 GE
View the AX9000G-LC25 →
FULL CATALOG

All FortiSwitch AX9004G Fan Module purchasing options

Every available SKU for the FS-AX9004G-FAN. In stock, brand new; support and licensing delivered electronically worldwide.

Hardware

Brand-new, sealed · ships same / next business day · price shown live in your selected currency.

FortiCare support

Available by quote — ask us for pricing.

RMA & hardware replacement

Available by quote — ask us for pricing.

FortiCare and subscriptions delivered electronically worldwide · prices shown live in your selected currency · add-to-cart enabled when in stock.

ACCESSORIES

What you also need with the FortiSwitch AX9004G Fan Module

The other parts you need to put this component into service.

This part goes into an AX9000G chassis. If you are building one from scratch, these are the other pieces you will need.

FortiSwitch AX9004G chassis, four line-card slots
FortiSwitch AX9004G chassis, four line-card slots
FS-AX9004G
View →
FortiSwitch AX9008G chassis, eight line-card slots
FortiSwitch AX9008G chassis, eight line-card slots
FS-AX9008G
View →
Supervisor module — one required per chassis
Supervisor module — one required per chassis
FS-AX9000G-SUP
View →
48-port multi-gig 802.3bt PoE line card
48-port multi-gig 802.3bt PoE line card
FS-AX9000G-LC10P
View →
32-port 100G line card
32-port 100G line card
FS-AX9000G-LC100
View →
FAQ

FortiSwitch AX9004G Fan Module frequently asked questions

Three. Fortinet requires three fan modules for normal operation regardless of the number and combination of supervisor modules and line cards installed. The requirement does not scale down for a lightly populated chassis — a chassis with one supervisor and one line card still needs all three.

No. The FS-AX9004G-FAN fits the four-slot FS-AX9004G only. The eight-slot FS-AX9008G uses its own module, FS-AX9008G-FAN. Power supplies are shared between the two chassis, but fan modules are not.

Yes. The fan modules are hot swappable, as are the supervisor modules, line cards and power supplies. A failed unit can be swapped with the chassis in service, which is the point of keeping a spare.

Up to 18,000 BTU/h at maximum configuration, with front-to-back airflow and a measured noise level of 75 dB at 25°C. Operating temperature range is 0°C to 40°C. Worth checking against your rack and room cooling before installation.

No. The AX9000G chassis ships empty — fan modules, supervisor modules, line cards and power supplies are all ordered separately. Ask us to quote a complete system and we will make sure the three fans are on it.

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