The duct-sealing process starts with a pre-test of duct leakage, then either hand sealing accessible joints with mastic or Aeroseal injection for hard-to-reach leaks, followed by a verification test. Aeroseal jobs run 4–8 hours; hand sealing on accessible ducts can run a half-day to a day depending on access.

Step-by-step

  • Measure existing duct leakage (CFM at 25 Pa)
  • Identify accessible joints — seal with mastic and metal tape
  • For inaccessible runs, inject Aeroseal aerosol sealant
  • Re-measure leakage and verify improvement
  • Provide a written before/after report

We pick the right method for your system. See Aeroseal duct sealing for hard-to-reach systems, or traditional duct sealing when ducts are accessible.