Old or poorly installed ducts can create a myriad of issues within all systems from kitchen exhaust to HVAC. These problems differ with the different types of systems; however, the main issue is leaks and additional strain on fans.
If a duct hasn’t been installed or sealed properly in a kitchen exhaust system, grease and oil will leak through the seams and cause major issues throughout many different areas of the building.
More often than not, people aren’t aware of these leaks or turn a blind eye to it, thinking that it isn’t a major issue. This can significantly increase the risk of fire, and the damage caused even without the presence of fire, with ceilings often collapsing under the weight of oil-laden gyprock.
The electrical components and other close-range combustibles within ceiling cavities can be a recipe for disaster when mixed with grease-fuel.
The second most common issue caused by old or poorly installed ducts with leaks is the drawing of air from the ceiling cavity or other undesignated areas. This decreases the system performance exponentially and can create major issues with suction and efficiency. At the same time, it can also cause fan motors to draw more power than the intended purpose during installation.