Your search for "ex4300-fan" revealed the following:
Juniper EX4300-FAN EX4300 Series Front-to-Back Airflow Switch Fan Module
SKU: NSH-8770
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 72.99
• Only 2 remaining
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Juniper EX4300-FAN-AFI EX4300 Series Back-to-Front Airflow Switch Fan Module
SKU: NSH-4483
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 29.99
• Only 2 remaining
Call if you need more
NEW Juniper EX4300-FAN-AFI EX4300 Series Back-to-Front Airflow Switch Fan
SKU: NSN-2970
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 31.99
• Only 2 remaining
Call if you need more
NEW Juniper EX4300-FAN EX4300 Series Front-to-Back Airflow Switch Fan Module
SKU: NSN-0378
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 76.99
• Only 1 remaining
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Juniper QFX5100-FAN-AFO F-B Switch Fan Module for QFX5100 and EX4300 Series
SKU: NSH-6176
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 29.99
• 49 in stock
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Juniper EX4300-48T 48x 1GB RJ45 4x 40GB QSFP+ Front-to-Back Airflow Switch
SKU: NSH-4913
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 219.99
• Only 2 remaining
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Juniper EX4300-48T-AFI 48x 1GB RJ45 4x 40GB QSFP+ Back-to-Front Air Switch
SKU: NSH-4917
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 282.99
• Only 2 remaining
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NEW Juniper EX4300-24P-TAA 24x 1GB PoE+ RJ45 4x 40GB QSFP+ F-B Air (TAA) Switch
SKU: NSN-3553
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 494.99
• 6 in stock
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NEW Juniper EX4300-48T 48x 1GB RJ45 4x 40GB QSFP+ Front-to-Back Airflow Switch
SKU: NSN-2754
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 425.99
• Only 2 remaining
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NEW Juniper EX4300-48MP-FAN EX4300 Series Front-to-Back Airflow Fan Module
SKU: NSN-4739
Condition: New
Shipping: Overnight Options
Warranty: 365 days