\begin{center}
    \begin{tikzpicture}
        \draw[step = 0.5cm, gray, very thin] (-7.25, -2.75) grid (7.25, 0.25);

        \node[cooling tower, /cooling tower= dry] (A) at (-5.5, -2.0) {};
        \node[anchor = south] at (-5.5, 0.25) {\textbf{dry}};

        \node[cooling tower, /cooling tower= forced draught] (A) at (-2.0, -2.0) {};
        \node[anchor = south] at (-2.0, 0.25) {\textbf{forced draught}};

        \node[cooling tower, /cooling tower= induced draught] (A) at (2.0, -2.0) {};
        \node[anchor = south] at (2.0, 0.25) {\textbf{induced draught}};
        
        \node[cooling tower, /cooling tower= wet] (A) at (5.5, -2.0) {};
        \node[anchor = south] at (5.5, 0.25) {\textbf{wet}};
    \end{tikzpicture}
    \\[0.25cm] 
\end{center}