Professional HVAC technicians utilize specialized, high-grade commercial materials and advanced technological systems to seal residential ductwork permanently. For manual sealing of accessible joints, seams, and metal takeoff collars in basements and crawlspaces, technicians apply water-based fiber-reinforced duct mastic paste with a brush or trowel, covering it with UL-181 approved aluminum foil mastic tape that provides a durable, airtight seal resistant to temperature swings. For hidden ductwork buried deep inside walls, ceilings, and inaccessible attic spaces, technicians use an automated aerosol injection sealant process called Aeroseal, which pressurizes the entire duct system and forces microscopic polymer particles to bond over gaps from the inside out. You can inspect applied seals visually. You can verify successful sealing when post-service pressure tests confirm zero air loss.
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