Why we fabricate our own sheet metal — and what it does to your schedule

Most mechanical contractors buy their duct. It is a reasonable way to run a business, and for straightforward work it is fine. It stops being fine the moment a job needs something that is not in a catalogue — which, on retrofit work in buildings that have been modified three times, is most of the time.

The lead-time problem

Here is how it usually goes without a shop. Crew opens up the ceiling or gets on the roof, finds the existing opening is not what the drawings said, measures, and sends dimensions to a fabricator. The fitting goes into that fabricator's queue behind everybody else's. Two to three weeks later it arrives — and if a field dimension was off by an inch, the clock starts again.

Meanwhile the space is on portable cooling, the ceiling is open, and the crew has moved to another job and has to be remobilized.

What changes when the shop is yours

Field measurements go straight to our own floor in Abilene. Custom transitions, plenums, offsets, and curb adapters get built in days rather than weeks, and a revision is a conversation rather than a new purchase order. The crew that took the measurement can walk into the shop and point at what they need.

The practical effect is that duct stops being on the critical path. On a rooftop changeout where the new unit does not match the old curb, that is frequently the difference between a weekend outage and a three-week one.

What we build

• Custom duct, transitions, and offsets to field dimensions
• Plenums and curb adapters for equipment that does not match what it replaced
• Spiral and rectangular fittings
• Kitchen and equipment hoods
• Insulated and lined assemblies
• One-off parts and repairs — the fitting that does not exist in any catalogue

Why it also makes the diagnosis better

There is a subtler benefit. When you cannot fabricate, there is a quiet pressure to make the building fit the parts you can buy — to call an airflow complaint an equipment problem because the duct fix is inconvenient. When the shop is down the hall, the honest answer and the easy answer are the same answer.

Most airflow complaints are duct problems, not equipment problems. A contractor who cannot economically touch the duct is structurally inclined to sell you a unit instead.

The crew

They are called the Tin Benders around here, and the name has stuck for long enough that it is on the merchandise. It is skilled work — layout, brake, and seam work that takes years to get good at — and it is the reason we can say yes to jobs other contractors quote around.