Abstract: A system for ventilating an enclosure for electronic equipment has an axial fan mounted between first and second pipes. The first and second pipes have major and minor diameters, the diameters being sized to fit into different sized of standard ventilation duct. The first and second pipes, the fan, mounting means, and an optional gas cap can be assembled to provide airflow through the system in either of two directions. The system if preferably connected by ducting to an enclosure having heat-generating electronic components and mounted some distance away therefrom, such as in an attic space.

Abstract: A chimney exhaust system for facilitating or creating an upward draft in a chimney flue, operating on what is referred to as "Bernoulli's Principle" comprises a housing unit having a tubular cross member and a tubular depending member, both members having an inlet and an outlet. The outlet of the depending member intersects the cross member at an intermediate position between the inlet and outlet of the cross member. The depending member is mounted to a chimney flue at its inlet and acts as an extension thereof. A fan is attached to the housing unit proximate the cross member to generate air flow through the cross member and across the opening of the depending member's outlet. The air flow generated through the cross member creates an upward draft of the air in the chimney flue and the depending member.