Why do you need this service? These are fire safety, getting rid of unnecessary odors in the room and monitoring compliance with sanitary and epidemiological standards. Each room has its own regulations on the timing of periodic cleaning of ventilation: from 1 year to 3 years.
Dryer vents can become very problematic when they go unchecked, and in worst case scenarios can spark a fire that spreads quickly. Flammable lint build up is a dangerous factor for any homeowner, and precautions should be taken to assure your dryer vent is functioning properly. Aside from the risk of fire damage, clogged dryer vents can take a toll on your energy bill as well. The dryer typically needs to run longer to dry a load, resulting in more energy use and higher bills.