Fig. 8.80.

Streamlines with different distances between the bottom of return air grille and the floor; 1 experimental streamlines when height of return air grille is b/10, and distance from the floor is b/20; 2 experimental streamlines when height of return air grille is b/20, and distance from the floor is b/10; 3 experimental streamlines when height of return air grille is b/10, and distance from the floor is b/10; 4 Experimental streamlines when height of return air grille is b/10, and the bottom is on the floor