Hi to all! Question: I need to install an exhaust fan for bathroom, second floor, about 30, off of ground. Can I use a diamond core bit when drilling off a ladder with, for example, an angle grinder? I am not sure if I need to have a water tank to keep the bit wet. I am just concerned as I am going to be off the ground on an extension ladder. I have used core bits for block walls( CMU) and use dry, no problem. I am just looking for some suggestions as to my options here. I have used the DD 130 HILTI wet core system on jobs, but this is a house, and I would not want to take something like that on a ladder up 30,. I have also heard that I could make a circle, and drill many holes around the circle, that way. I want to buy the Diamond core bit, at least that is what I think I need, to drill this hole. I am just looking for some suggestions before I purchase anything. My main concern is not blowing out the hole, and creating a bigger hole that I have to patch. As always, I,m grateful for member,s support on this forum. Thanks!