what great clearance

[ldmth44]

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.

[hvac wiz 79]

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