Fan shroud adaptor and assembly

A fan shroud adaptor for use with a fan having a circumferential wall for convertible fan use including air intake into the building, air circulation within the building and air exhaust from the building, comprising:

• (a) a substantially flat frame attachable to a building wall as to close a building opening through the wall to the outside;
• and
• (b) an opening in the frame with means to support the circumferential wall of the fan in the frame opening for air exhaust and circulation, and wherein the frame has two side edges, one of which is hingedly attached to the building wall to permit the frame to swing inwardly of the building to a position to also permit the fan to be used for air circulation in the building.

A fan shroud adaptor for use with a fan having a circumferential wall for convertible fan use including air circulation within the building, air intake into the building, and air exhaust from the building, comprising:

• (a) a substantially fiat frame attachable to a building wall in confronting relationship with a building opening through the wall to the outside;
• and
• (b) an opening in the frame with a flange adjacent the opening adapted to assist in guiding the fan onto the frame adjacent the opening and to support and engagingly hold the circumferential wall of the fan in close sealing engagement in the frame and the building wall openings for air exhaust, intake and circulation.