A safety system is for the clothes dryer. The safety system determines whether the flow of exhaust air is above a pre-set level, and causes an interruption of electrical power to the clothes dryer if there is not. The invention provides for more efficient drying of clothes and reduces risk of fires....http://www.google.com.au/patents/US20040187343?utm_source=gb-gplus-sharePatent US20040187343 - Appliance attachable to a dryer and a dryer for use therewith
