Types of mailboxes (passive-active) active with fan/active connected to the air conditioner

Types of mailboxes (passive-active) active with fan/active connected to the aerator of the mailboxes

In terms of performance, they are divided into two categories, active and passive

Postbox is active

It has a ventilation system and the filtered air flows through the nozzles/valves installed in the back boxes. So the active boxes are divided into two categories:

Active set boxes with independent ventilation:

In this type of post box, a separate fan motor is installed on the device, which enables the ability to adjust the operation of the fan and also does not require a ducting system.
Active mailbox connected to the central ventilation system:

In this type of mailboxes, the incoming air flow to the mailbox is supplied through an air conditioner and requires ducting. Passive postbox In this type of postbox there is no air flow.