Depending on the environment, the blades should be cleaned once or twice a year. It is recommended that, once a year mechanical connections be checked for proper tension. This also includes electrical connections in the fan controller and motor.
The fan does not create negative or positive pressure as it only moves air.
In most cases the customer prefers to install their own fan; however an installer can be recommended.
Lifetime warranty on the blades and hub, limited 5 year warranty on the gear reducer motor.
Pennies per hour.