Your search for "br-mlxe-4-fan" revealed the following:
NEW Extreme Brocade BR-MLXE-16-FAN MLXe Series Exhaust Fan Assembly Kit
SKU: NSN-9262
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 254.99
• Only 2 remaining
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Extreme Brocade BR-MLXE-4-FAN MLXe Series Exhaust Fan Assembly Kit
SKU: NSH-9223
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Extreme Brocade BR-MLXE-4-MR2-M-AC 4x Slot MLXe-4 AC Router Chassis
SKU: NSB-6357
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Extreme Brocade BR-MLXE-8-FAN MLXe Series Exhaust Fan Assembly Kit
SKU: NSB-6732
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days