Abstract: A warning system for a hair dryer to warn the user when the air inlet of the dryer has become clogged with hair or other particles, the dryer including an air filter in the inlet, an air-actuated whistle having an air inlet end and an air outlet end, the whistle being mounted in the air inlet with the air inlet end outside the filter and the air outlet end inside the filter. Air will pass through the whistle when the inlet has become clogged, causing it to blow, and thereby warning the user that the inlet has become clogged. This occurs when the air pressure differential between the two sides of the filter reaches a predetermined level.

Abstract: An air diffuser for a hair dryer having a porous diffuser face, panels secured to the diffuser face and to one another to form a plenum chamber. A spout is attached to the plenum chamber on the side opposite the diffuser face. When the spout is fitted about the air outlet of a hair dryer, the air will pass through the plenum chamber and be diffused as it passes out through the diffuser face. The face and the panels are formed of flexible, plastic sheet material.