Which types of spaces typically require a dry pipe system for fire protection?

A dry pipe system is specifically designed for environments that are subject to freezing temperatures, where the presence of water in sprinkler pipes might lead to issues like freezing and bursting. The correct choice highlights ventilated attic spaces and freezer storage rooms as typical areas requiring a dry pipe system due to their potential for extremely low temperatures.

In these spaces, if a wet pipe system were installed, water could freeze and obstruct the sprinkler system's effectiveness. Dry pipe systems use air or nitrogen to maintain pressure in the pipes and only release water when the sprinkler heads are activated by heat and the air pressure is released, thus avoiding the freezing problem that could occur with a wet pipe system.

Other options include spaces not typically conducive to the installation of a dry pipe system due to their temperature regulation or construction. For example, while mechanical rooms may experience varying temperatures, they do not typically face the same freezing challenges as attic spaces or freezer rooms. Similarly, open parking garages may be adequately protected by other systems, while basements and crawl spaces might rely on wet pipe systems as they are more controlled environments in terms of temperature.