We investigate a double cavity optomechanical system generating single and double Fano resonance (multi-Fano).By altering a single parameter,the tunnelling rate g of the middle mirror,we are able to switch between single and double Fano line shapes.The first spectral line shape is stronger in the case of multi-Fano than in the case of single Fano.Also the behaviour of the steady state value of the displacement of the middle mirror,with respect to g,heavily influences the behaviour of double Fano lines in our scheme.This tunability along with using a single pump and signal/probe laser has an added advantage in situations where only low power consumption is available.