Think about you have a balloon crammed with air. In case you release the tip, air rushes out from your substantial-stress inside the balloon to your reduce-pressure exterior. As their name implies, rigid ducts are inflexible and don’t have any hazard of bends or kinks that bring about limited airflow. https://myleskzmyw.wikicommunication.com/5416054/5_easy_facts_about_pu_ducts_described