This detector is specially designed for use in either indoor or outdoor applications to provide a degree of protection against falling dirt, rain, sleet, windblown dust, splashing water and hose-directed water. The DH100ACDCLWP is listed for an extended air speed range of 100 to 4000 feet per minute (0.5 m/s to 20.2 m/s). IMPORTANT NOTES The following temperature limitations must be observed during the installation and handling of this product: Operating temperature: +32° to +131°F (0° to + 55°C