How to Install an Exhaust Fan (DIY) ✅ I recently installed an exhaust fan in my basement bathroom and here are all of the steps in this home improvement project: First, I drilled the hole through my foundation using a 4.25” core bit and a hammer drill. Next, I installed the vent pipe and hood that will connect to the ducting on the inside of the house and then route the bathroom exhaust to my home’s exterior. After that, I installed the exhaust fan by hanging it on the floor joists above using t