We Offer Custom HVAC Duct Fabrication in DC, Maryland & Virginia
Precision-built ductwork designed and fabricated for your residential, new construction or commercial space.
Built to Fit. Built to Last.
Not every building is the same, and off-the-shelf ductwork rarely fits the way it should. Liberty HVAC DMV offers custom HVAC duct fabrication for residential and commercial projects throughout the DMV area. From new construction to system retrofits and replacements, we design, fabricate, and install ductwork built specifically for your space — ensuring proper airflow, energy efficiency, and long-term performance.
Liberty HVAC DMV fabricates ductwork in-house, giving us full control over quality and allowing us to turn projects around quickly without relying on third-party suppliers.
Precision From the Start
Custom Sheet Metal Fabrication
Every duct system we fabricate starts with a detailed assessment of your space. Our technicians take measurements, review your HVAC system specifications, and design ductwork that delivers the right volume of air to every room or zone in your building.
What We Fabricate
Supply and return air ducts
Rectangular and round duct sections
Elbows, transitions, and offsets
Plenums and air distribution boxes
Custom fittings for non-standard spaces
Trunk lines and branch runs
Get It Right From the Ground Up
New Construction Duct Systems
Installing ductwork in a new construction project is the best opportunity to design a system that performs optimally from day one. We work directly with builders, contractors, and developers to fabricate and install complete duct systems that are sized correctly, routed efficiently, and sealed properly before walls go up.
New Construction Services Include
Load calculations and duct sizing
Full system design and layout
Fabrication and installation coordination
Pre-drywall inspection and testing
Final balancing and commissioning
When Your Existing Ductwork No Longer Cuts It
Retrofit & Replacement Fabrication
Older duct systems lose efficiency over time through leaks, corrosion, poor original design, or damage. When repairs are no longer cost-effective, we fabricate and install replacement ductwork that integrates with your existing HVAC equipment and improves system performance.
Common Retrofit Scenarios
Replacing deteriorated flex duct with rigid sheet metal
Redesigning undersized or poorly routed duct runs
Adding zones or extending ductwork for renovations or additions
Correcting pressure imbalances and airflow problems
Scaled for Larger Projects
Commercial Duct Fabrication
Commercial buildings present unique ductwork challenges — larger spaces, multiple zones, higher airflow demands, and stricter code requirements. We fabricate commercial duct systems for office buildings, retail spaces, restaurants, medical facilities, warehouses, and multi-family properties across the DMV.
Commercial Fabrication Capabilities
High-volume supply and return systems
Kitchen exhaust and makeup air duct fabrication
Rooftop unit duct connections and transitions
VRF and multi-zone distribution systems
Code-compliant fabrication per SMACNA standards
Lock In the Efficiency
Duct Sealing & Insulation
Fabrication is only as good as the installation. Every duct system we build is properly sealed at all joints and connections to prevent air leakage, and insulated where needed to prevent energy loss and condensation. Sealed, insulated ductwork keeps conditioned air where it belongs — in your living and working spaces, not your walls.
What This Includes
Mastic sealant or metal tape application at all joints
Fiberglass or foam duct insulation where required
Vapor barrier installation in unconditioned spaces
Post-installation leakage testing