Venting a dryer and bathroom fan together is not recommended due to the potential hazards that could result from the accumulation of particles. The International Residential Code (IRC) prohibits dryer vents from being connected to any other duct system. If you put the dryer and bathroom fan together and a fire breaks out, your insurance company could deny your claim and you could be held responsible for the damage. The IRC requires that the ventilation grilles of clothes dryers be made with a smooth inner surface, while the ventilation grilles of the bathroom fans can be made of flexible ducts, which have a ribbed inner surface.
PVC and Flexi Duct can be used to vent a bathroom fan, but they are not recommended for use with a dryer. The distance between the start of the transition duct and the final outlet of the duct should be at least 35 feet. Lint from the dryer could be trapped in the blades of the bathroom fan, clogging drains and toilets in the bathroom and causing condensation to accumulate. It is generally unacceptable to use a dryer vent duct for the bathroom fan, as it can introduce moisture or lint into the fan.
In addition, it is important to note that the bathroom fan and dryer cannot share a ventilation hole under any circumstances. So, if you want to improve ventilation in your home, it's best to ventilate the dryer and bathroom fan separately. You might think that venting your dryer and bathroom fan at the same time will save you time and energy, but this could lead to serious consequences. It is important to remember that venting a dryer and bathroom fan together is not recommended due to safety concerns.
If you are looking for ways to improve ventilation in your home, it is best to ventilate them separately. This will ensure that your home is safe from potential hazards and that your insurance company will not deny your claim in case of an emergency.