These are ultra reliable, German built, light industrial turbo In-Line fans. They have been designed to run 24 hours a day, 365 days a year. They are also the most quiet fans we have found, unless an acoustic box fan is used.Supplied with fan to wall clamp. Suggested approx. 13.5m2 room Recommended up to 3600w light at average environmental temperatures- not accounting for a hot summer! 2 year guarantee.