The list of diagnostic tests mentioned in various sources as used in the diagnosis of Pregnancy includes: 1  Urine human chorionic gonadotropin (HCG) tests - these are the basis of home pregnancy tests. 2  Home pregnancy tests. 3  Pregnancy blood tests.
Quick Answer. Ductless bathroom fans remove odors and germs by filtering the air through an activated charcoal filter. These fans have a lower blade speed, also called a tip speed, which allows more air to be sucked up into the filter. Once cleaned, the air is re-circulated back into the bathroom.
Now, let's look at the types of systems. Exhaust-only. All right, let's get this one out of the way first. Using exhaust fans is great for local ventilation of bathrooms, kitchens, garages, and sub-slab areas (for radon control), but it's not a great strategy for whole-house ventilation. It does have some advantages: It's cheap.