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6 FAQs about [How to deal with cracked rock drill air duct]
How do you fix a crack in a duct?
If there are large cracks or holes, you will need to give those areas special attention: Tape over large holes and cracks to reinforce the duct, then apply mastic over the tape. Clean the joints on the sheet metal using a regular household cleaner and rag. Mastic bonds are better on clean surfaces.
Does water flooding damage ductwork?
Water flooding in ductwork ruins it and is discussed at WET CORRODED DUCT WORK and at WATER & ICE IN DUCT WORK. The rusted out duct photo at left shows a common return air duct system in some older homes: space between the floor joists was used as an air passage, sometimes also for supply air.
Do rusted out ducts cause air leaks?
Yes, when the metal sheeting nailed across the floor joist bottoms in older homes, which is used as an air passage, has rusted out, severe air leaks occur.
What happens if ductwork rusts?
Rust in spiral metal duct work can lead to collapse (as shown in the photo at left). Additionally, zone dampers that are stuck can obstruct air supply into a building area or, if stuck in the 'open' position when they should be closed, reduce airflow to other building areas. See the slab ductwork link just above for more information.
Can flex ducts be crushed?
Flex ducts can potentially be crushed, as shown in the example above. In this case, we were also concerned about the exposed fiberglass in the duct, which appears to have been mechanically damaged, possibly due to a too-aggressive attempt at duct cleaning. This could result in higher levels of airborne fiberglass duct insulation fragments in the building.
Why is there dust in my HVAC ductwork?
Dust accumulation inside HVAC ductwork is quite common and normal, especially when a rough surface is exposed to airflow through the system. The issue is more pronounced if the system does not use an adequate air filter at the return air inlet.


