So this is a quick note to clear up some confusion I had regarding the airflow on Juniper EX4550 switches.
The airflow on these switches is either front-to-back or back-to-front however this is not immediately apparent from the datasheet, and this is always my quick go-to place for information. I think this is mainly my fault for not reading this properly but it is also written in a confusing way.
The datasheet states:
"port side to PSU side airflow" which if you are reading this quickly looks suspiciously like "side-to-side"
To be sure I've had this checked with Juniper, and it is verified in the tech doc below, but the airflow is definitely front-to-back, back-to-front PSUs are also available.
References
EX4550 PSU Tech Doc:
EX4550 Datasheet:
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