Custom Ductwork Design and Installation in Oregon City, OR

Before any duct is sized or routed, we calculate the heating and cooling loads for your home using the Manual J load calculation methodology. This accounts for your home's square footage, insulation levels, window placement, ceiling height, and climate data specific to the Oregon City area. The load calculation tells us exactly how much conditioned air each room needs to stay comfortable, measured in cubic feet per minute, or CFM. Every duct size we specify starts from that number.

Skipping the load calculation and duct sizing based on intuition or a rule of thumb is one of the most common mistakes in residential installations. A 2.5-ton AC system, for example, moves roughly 1,000 CFM of air. If the ducts aren't designed around that number, the system will either starve for air flow or dump too much air into the wrong places.

Once we know the CFM requirements for each space, we design a duct layout that delivers that air efficiently. This means keeping duct runs as short and direct as possible, minimizing the number of elbows and fittings, and routing ducts through conditioned space wherever the building envelope allows.

Every bend, transition, and fitting in a duct system creates friction and pressure drops. We account for this using the equal friction method, which maintains consistent static pressure throughout the entire system by sizing each duct segment to offset the resistance it adds. This is how you get balanced air flow from the first register to the last.

We also plan for proper return duct placement. A duct system that delivers supply air to every room but doesn't have adequate return air paths creates pressure imbalances that choke the whole system. Return design is just as important as supply design, and it's frequently overlooked.

The two most common duct materials in residential installation are sheet metal and flex duct. Sheet metal is more rigid, more durable, and more efficient for main trunk runs. Flex duct is useful for final connections to registers where routing around obstacles is necessary, but it has real limitations. Flex duct that is compressed, kinked, or run in long unsupported spans loses significant air flow capacity and creates turbulence that degrades performance. We use flex duct where it makes sense and sheet metal where it doesn't.

Every duct in the system is sized to carry the CFM it needs at an appropriate air velocity. Too fast and you get noise. Too slow and you lose heating and cooling capacity before the air reaches the room. We size every run to hit the target range.

A duct system that leaks conditioned air into an attic or crawl space can lose 20 to 30 percent of its output before that air ever reaches a register. We seal all joints and connections with mastic sealant or foil tape — not cloth duct tape, which dries out and fails within a few years. All ducts installed in unconditioned spaces are properly insulated to prevent thermal loss and condensation.

Every ductwork design project we complete includes a materials list, plans, and installation specifications. For projects that require permits, we handle the permitting process and coordinate inspections. You'll have documentation of what was installed and why.