Find the collection efficiency of a horizontal flow single straight SP consisting of two sections formed by plates $4$ m wide and $6$ m high on $25$ cm centres handling a glass handling a gas flow on $2\mathrm{.}5$ m cube per second assume the migration velocity has $12$ cm$/$s also calculate migration velocity in the ESP collection plate area is increased to $110$ m$^2$ and gas flow rate is unchanged for collection efficiency of $99\mathrm{.}5\%$