An exhaust fan, having a small unbalance, weights \(800 \mathrm{~N}\) and operates at a speed of \(600 \mathrm{rpm}\). It is desired to limit the response to a transmissibility of 2.5 as the fan passes through resonance during start-up. In addition, an isolation of 90 percent is to be achieved at the operating speed of the fan. Design a suitable isolator for the fan.