Both putty sealant and aluminum foil tape are good options for sealing air ducts. Despite the name “dust tape”, never seal air ducts with adhesive tape. It just doesn't hold up. Regardless of the sealant you choose for your ducts, be sure to choose a high-quality product and clean the application area firstAdhesive tape is considered to be the most versatile type of tape and is a staple for many homeowners for a variety of DIY projects.
Modern adhesive tape is made with woven fabrics for strength and flexibility. It can be used almost anywhere where strong adhesion is needed, although it is susceptible to high temperatures and leaves residue when removed. As we mentioned before, adhesive tape should NOT be used to seal HVAC ducts of your home. Putty or aluminum tape is a better choice for that job.
Fortunately, the ducts that run through your house can be sealed with aluminum tape or duct putty, and every master or DIY contractor has their own preferences when it comes to what they use when working on residential ducts. The putty can be generously applied to duct joints and to leaks, and is a great option to ensure that the seal does not spoil over time. Although the name of this product makes it seem perfect for the job at hand, never seal ducts with adhesive tape. If you prefer not to use duct putty to seal your air conditioning system, aluminum tape is a good alternative.
Adhesive tape is not approved for use on ducts and, although it works very well for a variety of heavy projects, it does not withstand the conditions of a HVAC.
