To evaluate the expression \(1.1h\) for \(h = 16.9\), you can substitute \(16.9\) in for \(h\):
\[ 1.1h = 1.1 \times 16.9 \]
Now, perform the multiplication:
\[ 1.1 \times 16.9 = 18.589 \]
Thus, the value of the expression \(1.1h\) when \(h = 16.9\) is:
\[ \boxed{18.589} \]