I installed a pressure balancing bath and shower set from American Standard in my recently built walk in shower. This shower does not have a bath so I blocked off the outlet to what would have been the bathtub faucet. It now leaks sporadically from the shower head. I changed out the cartridge but it is still leaking enough to keep the shower floor damp. I did notice that if I run the bathroom fan there will be a short burst of drips from the shower head. I have placed a pail under the shower head to catch these drips and I can hear them when they hit the bottom of the plastic pail. The drips are not steady like you would have with a leaking pressure valve faucet for example. I am theorizing here but am wondering if the problem lies in the unit. When one turns off the shower I am thinking that water will remain standing in the pipe running up from the balancing unit to the shower head and that it is this water that is prompted to drip when something shakes the wall [as in the bathroom fan]. If the bathtub faucet were installed, water could have run down this pipe and effectively cleared the lines. Blocked off, the water has nowhere to go and stays in the pipe and drips when disturbed. Is there any solution to this other than to find a new unit? I tried to phone American Standard but their voice mail effectively shuts off all communication. Whaddaya think?