The suction pocket is part of the ventilation system and is the first element in the path of polluted air. The task of this device is to clean the flue gases taken from the furnaces from large impurities.
The pockets are technically an iron body with stiffening ribs. On one side of the pocket there is an opening for flue gas intake from stoves, on the other side there is a branch pipe for connection to a smoke exhauster or an industrial fan. The principle of operation of the suction pocket is based on the action of the forces of gravity. After passing through the air collector, dirt falls down to the bottom of the pocket. The flow created by the fan cannot raise dirt to the level of the nozzle, as it passes a little higher.
Suction pockets are designed to reduce pressure loss if there is a turn on the suction gas duct in the immediate vicinity of the blower (less than 3/4 of the impeller diameter). In addition, they prevent large particles from entering the cavity of the smoke exhausters, which could damage the equipment.