Scope of Hand Sealing (Exterior treatment):
- Register boots were sealed to the floor or to the ceiling.
- Return plenums were sealed inside with mastic.
- Air handlers were sealed from the outside with mastic.
- Where accessible, the ridges trunk ducts and the trunk to flex duct connections inside attics were sealed with mastic.
Scope of Machine Sealing (Interior treatment):
Aeroseal sealant could reach ducts that were inaccessible by hand. Return ducts were too small to use the Aeroseal system, so these were hand sealed. Air handlers and junctions between registers and walls, ceilings and floors were also hand sealed. (Note: In many cases the Aeroseal can be used to seal return systems. A wide connector in the duct system can split the air stream towards the return and the supply so both are treated at once.) This work is done by an independent firm licensed to do the Aeroseal product.
