The EN5040-T / ISW-EN5040-T should not to be exposed to environmental elements. If the repeater is to be installed outdoors, use the ACC640 outdoor weatherproof enclosure.
Without the weatherproof enclosure the EN5040-T / ISW-EN5040-T must be installed where the operating temperature is between 0°C to +60°C (+32°F to +140°F) and relative humidity is below 90% and non‑condensing.
Note: the ACC640 and ISW- ACC640 are the same part. The ACC640 is listed in documentation for use with the EN5040-T and the ISW-ACC640 is listed with the ISW-EN5040-T. This was only for consistency in part numbers.