HOTEL AND MULTIFAMILY DUCT FABRICATION
Hospitality and multifamily duct is the most repetitive commercial work there is. The same guest room or unit detail repeats dozens or hundreds of times, the shafts stack, and the corridor trunk runs the length of every floor. That repetition rewards getting the first detail exactly right, because it is about to be built a hundred times. JMC fabricates that scope from Pascagoula, MS.
The other defining constraint is ceiling height. Corridor and unit plenums are tight, which is where flat-oval earns its place in the package.
Published August 5, 2026 · JMC Fabrication
A hotel floor plate is a set of nearly identical rooms served by nearly identical branches off a corridor trunk, stacked over and over. Once the unit detail is coordinated and approved, the fabrication is a production run rather than a series of one-off pieces. That is efficient, and it is also unforgiving: a dimensional error in the approved detail replicates through every unit before anyone catches it in the field.
The practical implication is that the coordination work at the front of the job is worth more here than almost anywhere else. JMC's engineering coordinates the typical unit and typical corridor detail in Revit against the customer's federated model, gets it right, and then the repeats fabricate from the approved detail.
Shafts are the other repeating element. Riser duct stacks floor to floor, and getting the shaft detail and the floor-to-floor transition right early removes a category of field problem that is expensive to fix once drywall is up.
Four elements, in roughly descending volume:
- Corridor trunk: Rectangular or flat-oval running the length of each floor, sized for the static the design carries and shaped for the plenum height available.
- Unit and guest room branches: The repeating element. Small branches, takeoffs, and transitions produced as coordinated sets from an approved typical detail.
- Shaft risers: Vertical duct stacking floor to floor, including exhaust risers, with the floor-to-floor transitions detailed as part of the set.
- Amenity and back of house: Kitchens, laundry, pool and spa areas, fitness space, and parking ventilation, which each carry different requirements than the guest room stack.
The profile choice is usually driven by ceiling space, not preference:
| Profile | Airflow performance | Plenum height needed | Where it fits |
|---|---|---|---|
| Rectangular | Good, higher friction | Lowest for a given area | Tight corridors, transitions to equipment |
| Round | Best, lowest friction | Highest for a given area | Where plenum height allows |
| Flat-oval | Close to round | Between the two | Corridors that need round performance in rectangular space |
Hotels and multifamily buildings frequently open in phases, with lower floors turning over to the operator while upper floors are still in construction. That turns delivery into a sequencing exercise rather than a single drop. Loads ship floor by floor in install order, tagged to the floor and stack they belong to.
On renovation work in an operating hotel, the constraint tightens further. Work happens floor by floor or wing by wing while guests occupy the rest of the building, with short access windows and no room to stage material in public space. JMC's covered storage means the balance of the package waits at the shop instead of in a hotel corridor.
- Unit or room count and the number of typical floor plates
- SMACNA pressure class and gauge from the mechanical specification
- Ceiling plenum heights in corridors, which drive the profile decision
- Liner or double-wall requirements, especially between units and in corridors
- Amenity and back-of-house scope, including any specialty exhaust
- Floor or wing sequencing and any occupancy phasing
- Drawings or Revit model access, or notice that JMC needs to build the model
Does JMC fabricate duct for hotel and multifamily projects?
Yes, as part of its commercial duct work. Hospitality and multifamily packages are highly repetitive SMACNA construction, which suits production-run fabrication once the typical unit and corridor details are coordinated and approved.
Why does flat-oval duct come up on hotel projects?
Ceiling space. Flat-oval delivers airflow performance close to round while fitting into a plenum that will not accommodate round of the same area. On corridors where the design needs round performance in rectangular space, flat-oval is the answer, and JMC fabricates oval and matching fittings as a coordinated set.
How does JMC handle the repeating unit detail?
Coordinate it once, then fabricate the repeats as production runs. Engineering details the typical unit and corridor in Revit against the customer's model, and once approved, the repeats come off the same detail, which keeps dimensions consistent across every floor.
Can delivery be staged floor by floor?
Yes, and on phased-occupancy projects that is the standard approach. Loads ship in install order, tagged to the floor and stack, with the rest of the package staged at JMC's Pascagoula facility until the field is ready.
Does JMC handle renovation work in an operating hotel?
Yes. The constraint is access windows and staging space rather than the fabrication itself, so loads get sized to what the crew can install and stage inside the work area, and the balance stays on JMC's floor.