How to Seal a Welded Grease Duct

Knowing how to seal a welded grease duct can make the difference between your grease duct system running smoothly and the fire from the grease duct leaking into your business or your home and causing an actual fire. After plenty of uses, a welded grease duct can become dangerously exposed and in need of some assistance. You can seal the grease duct with a silicone-based sealant, but the sealant must be fire-resistant. A regular sealant can prompt further duct damage.

Fire-resistant silicone
Silicone gun
Scissors
Silicone scrapper

Instructions

- 1
  Pull the metal pipe on the sealant gun back, and then place the sealant into the sealant gun. Push the metal pipe inward to readjust the pipe. According to the Captiveaire website, the 3M Fire Barrier 2000 + Silcone Sealant is the best type of sealant for the grease duct, because it can control the spread of fire before, during and after its exposure to open flames.
- 2
  Locate the areas of the grease duct that needs to be sealed off. Use scissors to cut the tip of the sealant off.
- 3
  Hold down on the sealant gun's trigger to extract the sealant onto the part of the grease duct that needs to be filled.
- 4
  Use an edged scrapper to smooth the sealant and seal all of the exposed areas. The sealant will need 30 minutes to dry; do not turn the grease duct on until the 30 minutes have elapsed.

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