Mechanical shop drawings

Get Every Duct Right Before It Reaches the Shop

Ductwork built from unclear drawings goes back to the shop. Our coordinated, fabrication-ready shop drawings are checked sheet by sheet, so crews install once.

See What Refabrication Costs You
  • Coordinated before fabricationClashes cleared with every trade.
  • Fabrication-readySizes, fittings and supports.
  • Submittal-readySMACNA and AS 4254.
  • Checked before releaseSenior review on every set.
  • Large rectangular ductwork runs with radius bends under a concrete slabLarge-scale ductwork
  • Rectangular and spiral ductwork serving air handling units in a data centerData center
  • Dense spiral duct routing below a roof structure in a hospitalHealthcare
  • Large-diameter spiral ductwork running the length of an airport terminalAirport terminal
  • 20+Years’ experience
  • 1,500+Projects supported
  • 350+Engineering professionals
  • 80%Repeat clients

Where margin leaks

Duct Rework Costs Your Margin

Ductwork takes the most ceiling space. Every drawing mistake becomes refabrication or delay.

  • Field Clashes

    Where margin leaks
    Ducts hit beams, sprinklers and pipes, and crews cut, reroute and wait for answers.
    What we fix
    Shop drawings built from a coordinated model, with clashes cleared before fabrication.

  • Wrong Sizes and Fittings

    Where margin leaks
    Sections built from unclear drawings arrive wrong and go back to the shop.
    What we fix
    Every size, fitting and connection dimensioned and checked before release.

  • Missing Supports

    Where margin leaks
    Hangers, supports and access panels left off the drawings are decided on site.
    What we fix
    Supports, hangers and service access shown on every sheet, so nothing is left to the field.

  • Slow Submittal Approvals

    Where margin leaks
    Incomplete or non-standard drawings are rejected, and installation waits.
    What we fix
    Submittal-ready sets prepared to SMACNA and your standards, so approvals come first time.
Ductwork coordinated with fire protection piping, cable tray and lighting

What we deliver

Shop Drawings Your Crews Can Build From

  • Ductwork Shop Drawings

    Fabrication and installation drawings for every duct run.

  • Coordinated Layouts

    Ductwork coordinated with structure, piping, fire protection and electrical.

  • Spool and Fabrication Sheets

    Section-by-section drawings your shop can build from.

  • Hanger and Support Drawings

    Support types, locations and spacing set out clearly.

  • Sections and Elevations

    Clear views of tight, congested ceiling spaces.

  • As-Built Drawings

    A verified record of installed ductwork.

  • We work in
  • Autodesk Revit
  • AutoCAD MEP
  • Navisworks
  • Your templates and standards

Level of development

More Detail, Less Refabrication

Ductwork detailed at the wrong level gets refabricated, and every rebuilt section costs schedule and margin.

  1. Stage
  2. LOD 100Concept
  3. LOD 200Schematic Design
  4. LOD 300Coordinated Design
  5. LOD 350/400Shop Drawings
  6. LOD 500As-Built

Cost to change a decision

$

Low

$$

Moderate

$$$

High

$$$$

Very high

$$$$$

Highest

Confidence in the model

Indicative

Approximate

Coordinated

Build-ready

Verified

Decide early, while change is cheap. Build from a model you can trust.

  1. Mechanical model at LOD 100: simple duct massing
    LOD 100

    Concept

    Early Vision

    owners & MEP engineers

    Check HVAC space needs before routing is set.

    What we model
    HVAC zones, major equipment, shafts and service areas.
    What it protects
    Avoids late layout failures
  2. Mechanical model at LOD 200: approximate duct routing with joints
    LOD 200

    Schematic Design

    Early Routing

    MEP engineers & estimators

    Price ductwork realistically before main runs are fixed.

    What we model
    Main duct runs, preliminary sizes and air distribution concepts.
    What it protects
    Fewer changes later in the project
  3. Mechanical model at LOD 300: accurately sized and coordinated ductwork
    LOD 300

    Coordinated Design

    Accurate & Coordinated

    MEP coordinators & general contractors

    Submit shop drawings from ductwork already free of clashes.

    What we model
    Exact duct sizes, routing, elevations, clearances and coordinated interfaces.
    What it protects
    Fewer RFIs, faster submittals
  4. Mechanical model at LOD 350/400: ductwork with hangers and supports
    LOD 350/400

    Shop Drawings

    Fabrication-Ready

    Where most margin is protected

    Typical for shop drawings

    sheet metal contractors & fabricators

    Fabricate ductwork that fits the first time it is built.

    What we model
    Fittings, hangers, supports, insulation, penetrations and section breaks.
    What it protects
    Minimal refabrication and rework
  5. Mechanical model at LOD 500: as-built ductwork with confirmed supports
    LOD 500

    As-Built

    Record Drawings

    owners & facility managers

    Maintain and modify HVAC from a verified ductwork record.

    What we model
    Confirmed duct routing, field changes and equipment data.
    What it protects
    A trusted HVAC record for decades

Not sure which LOD your program needs?

A senior engineer will tell you, and what each choice costs, in your Margin Assessment.

How it works

From Design to Fabrication

Ductwork is coordinated and detailed before it reaches the shop.

  1. 01

    Share Your Documents

    Send drawings, models and specs. We confirm scope, deliverables and dates in writing.

  2. 02

    Coordinate and Detail

    Sizes, fittings and supports are cleared with every trade before shop drawings are released.

  3. 03

    Check and Submit

    Senior review to SMACNA, the IMC and AS 4254 before fabrication drawings are released.

  4. 04

    Support Through Install

    Fast RFI answers and revisions on site, through installation, so crews avoid costly rework.

How Much Margin Is Duct Refabrication Quietly Costing You?

A two-minute Margin Assessment shows where your programs leak, in dollars, and what ductwork built right the first time could save.

Request a Margin Assessment

Confidential. No commitment.

What clients ask first

Mechanical Shop Drawings: Common Questions

Straight answers from our engineering team. If your question isn’t here, ask us directly.

Ask a senior engineer An engineer replies within one business day.
What do your mechanical shop drawings include?

Fabrication and installation drawings for HVAC ductwork: sizes, routing, fittings, supports, connections and sections, coordinated with every trade.

Which codes do you follow, and who is responsible for the design?

SMACNA and the IMC for US projects; AS 4254 and AS 1668 for Australian projects. Design responsibility stays with your engineer of record, who reviews and seals the work. Bimgraphix does not stamp drawings; we answer for every sheet matching your design inputs, and any gap is raised as an RFI, never guessed.

How do you make sure ductwork installs first time?

Drawings come from a model coordinated with structure and other trades, with clearances and access checked, then senior-reviewed before submittal.

How are fees and schedules set, and can you handle large programs?

Fees and delivery dates are fixed in a written proposal from your scope, priced per floor or per package, before any work starts. Large programs are released floor by floor or by zone, with the team sized to your schedule. Revision rounds are agreed up front, and anything outside scope is quoted before we do it.

How do you protect our drawings, models and data?

We sign your NDA before any files are shared. Your models and drawings remain your property, exchanged through Autodesk Construction Cloud, Procore or a secure link, and access is limited to the team on your project.

Start a conversation

Built for Programs Where Precision Is Never Optional.

For over 20 years, one standard has guided every model, drawing and component. Let’s talk about where your programs are losing margin.

Start Your Margin Assessment

Or write to info@bimgraphix.com

  • Response within one business day
  • Reviewed by a senior engineer
  • Confidential