It's been too long since I've been into a server room.
It was not uncommon to see half-depth switches in the era prior to 'hot aisles' and I definitely recall them pulling air in directions that you might not like. They were never deep enough to siphon air from the front of the rack.
If you have a switch fully populated rail-to-rail with ethernet jacks, it's not entirely clear to me where you should route air in a hot/cold aisle setup.
It was not uncommon to see half-depth switches in the era prior to 'hot aisles' and I definitely recall them pulling air in directions that you might not like. They were never deep enough to siphon air from the front of the rack.
If you have a switch fully populated rail-to-rail with ethernet jacks, it's not entirely clear to me where you should route air in a hot/cold aisle setup.