The main difference
DCP extinguishers use a dry chemical agent and are often selected for a range of common fire classes. CO2 extinguishers discharge carbon dioxide, which is often preferred where electrical equipment is involved and residue from powder may be undesirable.
Where each one is useful
A dry powder unit is often seen as a flexible option in some general risk environments, but it may leave residue and should be chosen based on the specific hazard and building use. CO2 units are commonly chosen where the risk is electrical or where a cleaner extinguishing method is preferable.
Selection should be risk-based
The best choice depends on the area, the likely fire type, the equipment in the room, and the practical realities of the site. This is why a property review is often the safest place to start before purchasing or replacing extinguishers.
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