Add "front-to-front" option for airflow.

[jcollie]

NetBox version

v3.1.8

Feature type

Data model extension

Proposed functionality

Add "front to front" option for airflow.

Use case

The Cisco ISR4321 has its air exhaust and intake on the front, as seen in this diagram taken from a Cisco manual.

Database changes

None.

External dependencies

None.

[jeremystretch]

Ignoring the absurdity of this design, if a device takes in and exhausts air from the same face, there's no need to track airflow direction.

[jcollie]

Yes, it's a silly design IMHO but it exists and was a relatively popular router in it's day. If we can't have "front-to-front" can we get "other" to indicate that it's not a passively cooled device and that the airflow is not unknown (which None would indicate to me).

[github-actions]

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[jeremystretch]

I'm going to add an option for "mixed," which IMO should cover all such odd corner cases.