How many bends must a dryer vent have? Bends inside a dryer vent must be averted Anytime achievable. Each time you have got ninety-degree bend, you might want to lessen the duration of the dryer vent by 5 ft, beginning in a max of 35 feet.If you have a fuel or electric garments dryer in your house, a dryer vent that permits excess dampness to escap