  We present a detailed analysis of xmm X-ray observations of the Narrow line
Seyfert-1 (NLS1) galaxy Ark 564 taken between 2000 and 2011. High-resolution
X-ray spectroscopy is carried out on the resultant high signal-to-noise stacked
spectrum. We find three separate photoionised warm absorbers outflowing at
velocities unusually lower than typical NLS1s. Using recombination timescale
estimates, improved constraints on the location of these clouds show they could
be located beyond 4 pc from the central source. Our estimates of the outflow
kinetics suggest that the AGN in Ark 564 is unlikely to affect the host galaxy
in its current state but over typical lifetime of 10^7 years the ISM could be
affected. The individual observations used here suggest the luminosity varies
over weekly timescales and in addition we find evidence of gas response to
changes in the ionising radiation.
