Red Seal Sheet Metal Worker Practice Exam

What is the main disadvantage of flexible ductwork?

1. Higher cost compared to rigid ducting

2. It can collect dust and pollutants easily

3. It is more challenging to install

4. It provides poor insulation properties

The correct answer is: It can collect dust and pollutants easily

Flexible ductwork is primarily known for its ease of installation and versatility in reaching difficult spaces. However, one of its main disadvantages is indeed its tendency to collect dust and pollutants more easily than rigid ducting. The inner surfaces of flexible ducts can have a larger surface area and are often made from materials that can trap dirt, dust, and allergens more effectively. This accumulation can lead to reduced air quality and increased maintenance needs, as dirty ducts can affect the efficiency of the HVAC system and require more frequent cleaning. The incorrectness of the other options lies in the context of the disadvantages of flexible ductwork. While the cost may vary, flexible ducting is generally considered more cost-effective than rigid ductwork. Installation is typically easier and faster with flexible systems, allowing for more straightforward adjustments. Lastly, insulation properties are generally considered effective with flexible duct options, especially when using insulated flexible ducts designed to maintain temperature and minimize energy loss, making the claims of poor insulation properties less relevant.