Ventilator

Claim 1

A VENTILATOR ARRANGED TO BE POSITIONED IN SUBSTANTIALLY PLANAR RELATIONSHIP WITH THE RAIL OF A DOOR, WINDOW OR THE LIKE, WITH A SLOT FORMED THERETHROUGH, TO BE MOUNTED WITHIN SUBSTANTIALLY THE THICKNESS OF THE RAIL, COMPRISING A FRONT COVER PLATE HAVING A PAIR OF PARALLEL GUIDE PLATE MEANS SPACED APART SUBSTANTIALLY THE HEIGHT OF THE SLOT ON ONE FACE THEREOF ARRANGED TO PROJECT INTO SAID SLOT OF SAID RAIL, A TUBULAR BAFFLE MEMBER HAVING UPPER AND LOWER WALLS HAVING ENGAGEMENT WITH SAID GUIDE PLATE MEANS AND SLIDABLE WITHIN THE LIMITS OF THE ENDS OF SAID SLOT BETWEEN SAID GUIDE PLATE MEANS, SAID BAFFLE HAVING FORWARD AND REARWARD WALLS, A REAR COVER PLATE MEMBER COUPLED TO SAID GUIDE PLATE MEANS, SAID FRONT COVER PLATE AND REAR COVER PLATE HAVING ALIGNED VENTILATING HOLES AND SAID FORWARD AND REARWARD WALLS OF SAID BAFFLE HAVING ALIGNED VENTILATING HOLES SEPARATED BY LANDS, THE HOLES OF SAID BAFFLE AND SAID COVER PLATES BEING ALIGNED IN ONE SLIDABLE POSITION OF SAID TUBULAR BAFFLE MEMBER, THE LANDS OF SAID BAFFLE OBSCURING SAID VENTILATING HOLES IN SAID FRONT AND REAR COVER PLATES IN ANOTHER POSITION OF SAID BAFFLE MEMBER, END CLOSURE MEMBERS FOR THE OPPOSITE ENDS OF SAID FRONT COVER PLATE, SAID GUIDE PLATE MEANS AND END CLOSURE MEMBERS EACH HAVING OUTSTANDING RIBS ARRANGED TO BE CO-PLANAR AND FORMING, WITH THE FRONT COVER PLATE, A SCREEN RETAINING SLOT ALONG THE EDGES OF SAID PLATE AND END MEMBERS.