A boiler has two identical FD fans connected in parallel. Each fan is driven by variable$-$speed motor. The fan performance at $1200$ rpm and $80$ F air is $1.$ A boiler has two identical FD fans connected in parallel. Each fan is driven by variable$-$speed motor. The fan performance at $1200$ rpm and $80$ F air is:

$\backslash$begin$\{$tabular$\}\{$lll$\}$

$\backslash$hline FLOW RATE $($CFM$)$ & STATIC PRESSURE $($IN$.)$ & STATIC EFFICIENCY $(\backslash \%)\backslash \backslash$

$\backslash$hline $560,000$ & $26\mathrm{.}8$ & $85\mathrm{.}1\backslash \backslash$

$400000$ & $28\mathrm{.}1$ & $78\mathrm{.}2\backslash \backslash$

$300,000$ & $28\mathrm{.}6$ & $69\mathrm{.}3\backslash \backslash$

$200,000$ & $28\mathrm{.}8$ & $55\mathrm{.}2\backslash \backslash$

$100,000$ & $28\mathrm{.}8$ & $32\mathrm{.}8\backslash \backslash$

$0$ & $28\mathrm{.}4$ & $0\backslash \backslash$

$\backslash$hline

$\backslash$end$\{$tabular$\}$

Determine and plot $($draw by hand$)$ the characteristic curves at the fan speed $1300$ rpm $.$