HVAC Air Duct Sealing
Stop Air Loss & Recover Energy Efficiency
HVAC air duct sealing is the closing of leaks at duct joints, seams, takeoffs, and plenum connections with hand-applied mastic and UL 181-listed sealant so conditioned air reaches the rooms it was sized for. SaniTech Services seals supply and return ductwork in commercial and residential systems across Long Island and New York City, usually alongside a duct cleaning, and documents each sealed location in a written report.
Leaky ductwork can waste 20–30% of conditioned air before it ever reaches its destination. SaniTech's air duct sealing service identifies and seals leaks in your duct system, improving energy efficiency, reducing utility costs, and ensuring consistent comfort throughout your building.
Our Sealing Method
SaniTech seals ducts by hand: technicians locate leaks at joints, seams, takeoffs, and plenum connections and close them with mastic and UL 181-listed sealant or tape applied directly to the duct. This is a different approach from aerosol-injected sealing systems that coat leaks from inside the duct; we quote and perform hand-applied mastic and sealant work only. Because sealing is most effective on a clean system, it is often scheduled alongside air duct cleaning.
Service Area
SaniTech Services is based in Hauppauge and serves Long Island, including Nassau and Suffolk counties, and New York City. Contact our team to discuss your property, system and scheduling needs.
Meet our team and review our credentials·Request a free quoteOur Process
Leak Assessment
We evaluate the duct system to locate leaks at joints, seams, and connections.
Sealing Plan
A sealing approach is selected based on duct material, location, and accessibility.
Sealant Application
Hand-applied mastic and UL 181-listed sealant are applied to joints, seams, and connections to close leaks and restore duct integrity.
Verification
Sealed sections are verified to confirm leaks have been addressed.
Project Report
A summary of locations sealed and methods used is provided for your maintenance file.
Key Benefits
Frequently Asked Questions
How much energy is wasted by leaky ducts?
Industry data commonly cites 20–30% of conditioned air can be lost through leaks in untreated commercial duct systems.
Will duct sealing disrupt operations?
Most projects are scheduled around facility hours to minimize disruption. We coordinate around your operating schedule.
Can you seal both supply and return ductwork?
Yes. We address both supply and return sides of the duct system as needed.
Get a Free Quote
Fill out the form and we'll respond within 24 hours.