Final answer:
Screens on clothes dryer exhaust vents are not permitted as they pose a fire hazard; instead, a damper or guard is used.
Step-by-step explanation:
The statement 'the screen is permitted on a clothes dryer's exhaust vent' is false. Residential building codes often specify that the clothes dryer's exhaust vent must not have a screen because it can collect lint and become a fire hazard. Instead, the dryer's exhaust system is designed to have a damper or a hood with a guard to keep animals out but without a screen that traps lint. Regarding electric clothes dryers, one engineering aspect of their design includes the counter-winding of the heating coils, which reduces their mutual inductance with the case, creating efficient and safer operation. However, this detail relates to the internal workings of the dryer and does not directly address the regulations concerning exhaust vents.
False. Screens should not be used on a clothes dryer's exhaust vent. While it may seem like a good idea to prevent lint from escaping, screens can actually obstruct the airflow and cause a buildup of lint, increasing the risk of a fire. It is important to allow for proper ventilation by using a vent hood or a vent with a backdraft damper to prevent lint accumulation and maintain the dryer's efficiency and safety.