Abstract: An exhaust system for evacuation of vapor and gases from an area, the system including a fan mounted on a motor, an activation circuit coupled to the motor and adapted to couple the motor to a first voltage source, a detection circuit adapted to sense the presence of moisture on a sensor surface and to generate a detection signal when moisture is sensed and to not generate a detection signal when moisture is not sensed, and a control circuit. In one embodiment the control circuit is coupled to the detection circuit and the activation circuit and adapted to generate a control signal in response to the detection signal, the control signal received at the activation circuit to cause coupling of the motor to the first voltage source after a delay programmed in to a programmable logic chip in the control circuit.

Abstract: The invention makes the decision to turn on the exhaust fan and dry out the confined space in the event that a factory predetermined moisture level has been exceeded, thereby limiting any destruction or health risks caused by negligence on the part of users or infrequent maintenance. Periodic Maintenance schedules are often extended so far as to be ineffective in moisture control. The invention takes the option to turn off the exhaust fan out of users control but not the option to turn it on. The invention is manufactured in such a way that all electronic components, sensor and pc board mounting fit into any ordinary switch box in a building electrical system and wire directly into the already installed wiring for the manual switch which it will replace.

Abstract: An integrally formed conveyor belt cleaning head (10) formed of a resilient material includes a substantially transversely extending cleaning tip portion (11). At least two integrally formed and substantially parallel, integrally spaced apart elongate arms (12) extend outwardly therefrom, substantially perpendicular to the transverse cleaning tip portion (11). The arms (12) extend into a substantially transverse base portion (14) which is adapted to engage with and/or be mounted to resilient mounting pad (18). Elongate reinforcing shoulders (19) extend at least partway along each of the arms (12).