Your search for "ex3400-fan" revealed the following:

Juniper EX3400-48T-TAA 48x 1GB RJ45 4x 1GB SFP+ 2x 40GB QSFP+ (TAA) Switch

SKU: NSH-8745
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper EX3400-24T-TAA 24x 1GB RJ45 4x 10GB SFP+ 2x 40GB QSFP+ (TAA) Switch

SKU: NSN-3604
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper EX3400-48P-TAA 48x 1GB PoE+ RJ45 4x 10GB SFP+ 2x QSFP+ (TAA) Switch

SKU: NSN-3703
Condition: New
Shipping: Overnight Options
Warranty: 365 days