a ring 70 to be described the ribs 68 extend outwardly to ring 70 and inwardly short of plate 69 the ring 70 includes a curved panel 71 which extends inwardly to an inclined panel 72 and outwardly to a rim 73 the rim 73 mates with rim 62 of grill 57 with spaced tabs 62 a therearound which are engaged with slots 74 in rim 73 to retain the grills 57 and 65 together in fig4 the ring dimensions are indicated by the letters a b c and d the dimension a is the distance from the tip 75 of a blade 55 to the inside diameter of the ring 70 the dimension b is the depth of ring 70 or the distance from the rear most portion of rim 73 to the front end of panel 71 the the dimensions a b c and d for the fan 50 in the preferred embodiment for a 16 inch fan with blade diameter d 16 inches are a 0 170 inches b 1 41 inches and c 0 95 inches the dimensions a b and c for oscillating fans with a typical blade diameter from 6 to 30 inches with d as an initial dimensional base point have the dimensions calculated as follows where the range of a is u2212 40 of d as measured from tip 75 b 0 60 to 4 5 inch and c 40 to 200 b it has been found by testing that a 16 inch fan.