Typical CPE System Description.

TM 3-4240-302-30&P-3

(2) The protective entrance provides a

c. Typical CPE System Description.

pressurized transition area between the

(1) The gas-particulate filter unit (GPFU)

shelter and the outside contaminated

removes toxic gases and dust from the air

zone.

Personnel entering from the

supplied to the protective entrance and

outside must wait 5 minutes within the

shelter. Outside and return air is drawn by

protective entrance before entering the

the main fan through the air inlet of the filter

shelter. Contamination is purged by the

unit. From the main fan, the air is pushed

flow of filtered air.

The PECM

through the particulate and gas filters to the

automatically adjusts the airflow valve

airflow valve.

The filtered air passes

and silencer assembly to maintain the

through the airflow valve and is carried by

proper air pressure inside the protective

airduct hoses to the protective entrance (PE)

entrance.

through the airflow valve and silencer and to

d. CPE System Configurations.

Collective

the shelter through the air conditioner.

protection equipment is configured to fit the needs of a

Pressure sensing components in the

specific application and may differ from the typical

compartment control module (CCM)

system discussed above.

automatically adjust the airflow valve to

maintain a positive pressure in the shelter.

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