A trombe wall has the upper opening $=4f{t}^2$ and the lower opening $=8f{t}^2$ and the vertical distance $=3m,$ Knowing that $T_{\text{r}\text{o}\text{o}\text{m}}=60F$ and $T_0=88F,$ find the following

A$)$ Type of air.

B$)$ Air flow rate in $\frac{m^3}{h}r.$

C$)$ The number of air change per hour if the space dimension is $11**9**3m$