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Completing The Work

  • WE STAND BEHIND OUR RECOMMENDATION. One of the first things that we do after arriving to do your job is connect our machine to your duct subsystem and pressurize it to measure initial leakage. If we’ve recommended sealing (during the assessment) and leakage is less than 20% of your furnace blower capacity, we’ll immediately review this with you and give you the option to abort the job at no further cost to you. You can rest assured that we’ll only recommend sealing if we believe that it will address your objective(s).
  • If we’re sealing both supply and return subsystems, the job typically takes up to 8 hours; if only the supplies, up to 5 hours.
  • Plugging the GrillWe’ll generally seal the supply subsystem first as it’s not uncommon for the return subsystem to utilize wall cavities which could bring supply subsystem leaks into play if they’re not already sealed. We’ll remove the register grilles and temporarily plug each with a sturdy foam pad. Meanwhile, we’ll cut an access hole in the supply plenum just downstream of the furnace (and a/c unit, if present) and isolate the furnace with a large foam pad and tape as necessary. We’ll connect the Aeroseal sealing machine to the access hole with 2-ft diameter flexible tubing. If initial leakage is exceptionally high, we will look for large holes including the possibility of disconnections or breaks in the duct work… and repair those first. After verifying that those repairs have reduced leakage to a reasonable level (which may still be on the order of 20-40% of system capacity), we will begin the Aeroseal sealing process; it typically takes 20 to 30 minutes to seal a supply system that’s in good condition.
  • During the sealing process, you may hear a hissing sound produced as the aerosol travels throughout the duct system. In the event that some aerosol may leak into the living spaces, we may employ one or more of our portable air filtration Setting up the Machinesystems to handle this and/or open windows and doors to encourage natural ventilation. Once we’re satisfied that the system is sealed and we’ve de-pressurized it, we’ll remove the foam pads in the registers and manually seal – caulk and/or expandable foam – the gaps between the wall opening and the duct boots.
  • The process to seal the return system is similar. The exception may be that, if the wall cavities are used to draw air from the rooms in the house to the furnace, the Aeroseal sealing process may take 60 minutes or more to complete.
  • Once both sides are sealed, we’ll replace the grilles and may take final temperature and air velocity measurements to compare to original conditions. In the meantime, we’re removing our equipment from the house, patching the access holes to the furnace, and cleaning up.
  • The sealants cure in about 2 hours. During this time, you may notice a slight odor similar to Elmer’s glue.
  • Finally, we’ll review the results of the service with you including Certificates of Completion for each Aeroseal sealing process (which will indicate the initial and final leakages for each system) and (if conducted) a before-and-after comparison of register temperatures and air flow rates, before reviewing the bill and requesting final payment.
  • Yard SignYou should notice an immediate improvement in comfort throughout the home, including more uniform temperatures from room to room and (if the return subsystem was sealed) you may notice a reduced levels of airborne dust and allergens. As you go through your next heating or cooling season… and for years to come, you should also notice a significant reduction in energy costs.