Looks like the wall may turn upwards for access, but they should have used a screen mesh or perforated panel for airflow. See it all the time in convenience stores.
UPDATE ..... this is self contained .. filters are packed with sh!t too .. yes that door swings out for service but it still looks like a PITA .. my concern would be lack of airflow in the first place .. im not sure of clearance requirements for hoshi but this is tight IMO
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