Today's homes are extremely well insulated and virtually air-tight. This is a great way to save money on your energy bills, but poor indoor air quality is a downside.
As windows and doors are typically kept shut throughout the day, moisture, and stale air can carry contaminants and pathogens circulate inside homes and give rise to various problems including mold and mildew, health problems, ruined furniture, peeling paint, etc. You can also click on the following source/link to know more about mechanical and fluid simulation:
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Types Of Exhaust Fans
1. Ceiling Mounted Exhaust Fans
As the name suggests, ceiling exhaust fans are those which are installed in the ceiling. Such fans expel stale air from your home upwards through the roof. The fan is connected to ducting, which is exhausted outside the home via an external vent, like a roof cap or soffit exhaust vent.
2. Inline Exhaust Fans
Unlike ceiling exhaust fans that are installed directly into the ceiling, inline exhaust fans are typically mounted in-between ducting, hence the name inline fan.
For instance, if you wanted to ventilate an area that did not have clearance or space for a ceiling mount fan, you would make use of inline exhaust fans to ventilate such areas.
The exhaust fan would be placed in between the ductwork and the stale air would travel through the ducts and ultimately be expelled from your home.