In particular, he wanted to allow for proper ventilation and exhaust. Not only do some filaments smell bad, but there is ongoing research around UFP (ultra-fine particles) emitted from the 3D ...

We tested a variety of fans for 4-inch and 3-inch ducts to find the best bathroom exhaust fans for airflow ... (usually an electrician, an HVAC tech, a general contractor, or a handyperson with ...