The compact Recair Sensitive RS300 is the obvious choice for everyone who wishes to improve ventilation and save energy, but do not have the space to house the larger RS160. The RS300 has a width of 9.13 inch and a length of 18.94 inch. The height can vary from 5.9 inch to 19.7 inch. Decreased size does not, however, mean decreased performance: the only difference between the RS300 and the RS160 is the size.