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HVAC Product Drawings | YONGFAN
Dimensional Control & Interface Verification

HVAC Product Drawings: General Arrangements & Nozzle Schedules

A drawing mismatch can turn a correct product selection into site rework, blocked maintenance access, misaligned connections, or a unit that no longer matches the approved project layout.

The conflict usually appears after other trades occupy the space: a fan flange fits but motor access faces a wall; a heat exchanger fits the footprint but the tube bundle cannot be withdrawn; a VAV terminal is sized correctly but plenum spigots mismatch the ceiling diffuser layout. Learn how to verify physical interfaces across fans, filters, VAVs, heat exchangers, and valves.

Fan Interfaces Flanges · Discharge Rotation · Motor Side
VAV Plenums YF-MOA Matched RCP Layouts
Thermal Nozzles Schedules to DN100+ · Bundle Clearance
Filter Frames 610×610 · Insert 20/45/65 mm
Request a Product Drawing Drawing Revision Protocol
Engineers reviewing HVAC general arrangement drawings and mechanical equipment schedules
Dimensional Accuracy & Fit General Arrangements, Connection Nozzles, Motor Clearances & Withdrawal Zones
01 / Site Risk Mitigation

Drawing Errors Become Installation Problems on Site

HVAC components are often selected by aerodynamic or thermal performance first and coordinated physically later. A catalog outline must never be treated as the final construction drawing.
Mechanical room installation showing piping connections and equipment access clearances
Dimensions Control More Than Fit

Coordinate Interfaces Before Freezing Structures

Casing length alters duct routing; motor position can clash with civil columns; nozzle locations force header offsets; obstructed withdrawal paths prevent maintenance.

Fan Discharge & Motor Handing

Ordering a centrifugal fan without confirming discharge angle (0°–270°) and motor access side forces complex on-site duct transitions.

Result: Costly duct modification & air turbulence

Ceiling Plenum Spigot Mismatch

Configuring a generic multi-outlet box instead of coordinating YF-MOA outlet spigots with the reflected ceiling plan causes flexible duct kinks.

Result: Diffuser airflow imbalance & ceiling clashes

Blocked Tube Bundle Withdrawal

Installing a U-tube storage heat exchanger without modeling the axial bundle pulling zone makes future descaling impossible without wall demolition.

Result: Unmaintainable pressure vessel installation

Filter Frame Depth & Seal Mismatch

Using generic 595×595 mm face size without verifying 20/45/65 mm frame insert depth or gel knife-edge profiles results in loose fit and air bypass.

Result: Air leakage & failed cleanroom validation
02 / Technical Coordination

Drawings Across HVAC Product Categories

Explore key dimensional parameters, nozzle schedules, and service clearances across fans, VAV plenums, filters, heat exchangers, and hydronic skids.
Category 01 · Ventilation Fans Flange Circles · Discharge Orientation

Ventilation Fans: In-Line, Roof, Centrifugal & Jet Fans

Similar airflow duties can use very different physical arrangements:

  • In-Line Axial & Mixed Flow (DTF, DTXF, SWF): Check casing outer diameter, flange pitch circle diameter (PCD), bolt hole count, overall length, and motor terminal box orientation.
  • Centrifugal & Cabinet Fans (4-72, SJG): Discharge rotation (0°–270°) and motor drive side determine whether the fan connects directly to the riser duct without extra elbows.
  • Roof Fans (DWT Series): Drawing must coordinate roof structural opening, curb base dimensions, weather cowl overhang, and electrical entry.
  • Direct Replacement (T35-11 / BT35-11): Source documents confirm matching flange and casing dimensions for specified variants to ensure drop-in replacement.
In-Line Casing Flanges
DTF, DTXF, SWF casing PCD & overall length
Centrifugal Handing
4-72 exact discharge angle & drive orientation
Roof Interfaces
DWT curb base, roof penetration & cowl overhang
Tunnel Jet Fans
SDS / SDS-R mounting brackets & silencer length
View Centrifugal Fans Request Fan Drawing
Dimensioned general arrangement drawing of industrial centrifugal fan showing discharge rotation
4-72 Centrifugal General Arrangement Drawing
Verification Rule:

Use the fan performance curve to verify airflow/pressure duty, and the dimensioned drawing to verify physical flange and mounting fit.

Category 02 · VAV & Plenums Matched Ceiling RCP · Spigot Schedules

VAV Terminals (YFVAV-S-T100) & Plenums (YF-MOA)

Air distribution terminals sit directly between structural slabs and architectural ceilings:

  • YFVAV-S-T100 Single-Duct VAV: Nine standard round inlet sizes from Ø125 to Ø400 mm. Optional hot-water reheat coils and sound attenuators extend body length to 1,000–1,100 mm.
  • YF-MOA Multi-Outlet Plenum: Sized per project from the reflected ceiling plan. YONGFAN provides matched configuration drawings showing exact plenum dimensions, inlet paired to the VAV terminal, and outlet count, diameters, and lateral positions.
VAV Round Inlets
Ø125, 160, 200, 250, 315, 355, 400 mm
Integrated Length
1,000–1,100 mm (including reheat & attenuator)
Plenum Standard Outlets
6 Standard configurations + bespoke RCP spigots
Actuator Clearance
Provide >300 mm side access for DDC controller
View VAV Terminals Request Plenum Drawing
Technical drawing layout of VAV terminal and multi outlet distribution plenum
YFVAV-S-T100 & YF-MOA Matched Drawing
RCP Coordination:

Provide diffuser count, positions, and airflow distribution so the returned YF-MOA drawing aligns with the actual ceiling grid.

Category 03 · Heat Exchangers & Hydronics Nozzle Schedules to DN100+ · Bundle Pulling

Heat Exchangers, Storage Vessels & Hydronic Booster Skids

Drawing quality directly determines plant room coordination:

  • U-Tube Storage Heat Exchangers: Documented connections increase with vessel volume and reach DN100. The drawing must show the nozzle schedule and preserve the axial withdrawal space required to remove the tube bundle.
  • Floating Coil Heat Exchangers: YONGFAN supplies full dimensions and nozzle schedules, and verifies nozzle positions against approved project drawings before dispatch.
  • Packaged Plate Exchanger Units & Booster Skids (JFHB, JFWP, JFDY, JFWZ): Sized as complete assemblies. Drawings coordinate skid footprint, pump positions, primary/secondary connection centerlines, drain points, and electrical cabinet access.
Nozzle Schedules
DN15–DN100+ with confirmed flange ratings
U-Tube Withdrawal
Preserve axial bundle pulling space equal to shell
Packaged Skid GA
Base frame footprint, pump access & control cabinet
Manifold Branches
Water Distributor & Collector nozzle layout drawings
View Storage Heat Exchangers Request Nozzle Schedule
Heat exchanger technical drawing showing nozzle schedule, vessel dimensions, and bundle withdrawal
U-Tube Storage Heat Exchanger Nozzle Schedule
Nozzle Schedule Note:

Never coordinate heat exchangers by port size alone. Sizing is project-dependent and nozzle locations must match certified drawings.

Category 04 · Filtration & Valves Fixing Frames · Actuator Envelope

Air Filters, Cleanroom Terminals & HVAC Control Valves

Dimensional details control physical fit, gasket compression, and actuator clearances:

  • Air Filters & Fixing Frames: Standard fixing frames are documented in 610×610×70 mm, 508×508×70 mm, and 305×610×70 mm with 20, 45, and 65 mm insert options. Drawings show gasket placement, depth, and bag pocket expansion clearance (>650 mm).
  • Cleanroom Terminals (GFK, GCFK, FFU): Coordinate ceiling cutout dimensions, shallow 150 mm depths (GCFK), and PAO test port locations.
  • Control Valves & Actuators: Valve drawings must show face-to-face length, thread/flange standard, actuator height envelope, cable entry, and pilot copper tubing for 100X–900X hydraulic control valves.
Filter Fixing Frames
610×610, 508×508, 305×610 mm; 20/45/65 mm inserts
Cleanroom Terminals
GFK, GCFK (150 mm shallow), FFU ceiling modules
Valve Actuator Height
Motorized FCU, EDV, KYQ & thermal actuator envelope
Hydraulic Pilot Tubing
100X–900X pilot line dimensions & clearance
View Filter Frames View Control Valves
Technical drawing of HVAC control valve showing actuator height and face to face dimensions
Valve Actuator Height & Clearance Drawing
Actuator Height Warning:

The actuator adds height and lateral clearance that is often larger than the valve body itself. Always verify total installed height.

03 / Revision Control

Drawing Status Matters as Much as Drawing Content

The same product can appear in three distinct drawing stages during a project life cycle. Understand which revision controls construction.
Drawing Stage Document Scope & Purpose When to Use Limitations
1. Catalog Outline Drawing
 Nominal dimensions, standard catalog envelope, general arrangement Early feasibility, preliminary space planning, tender estimation Does not include custom motor options, nozzle positions, or bespoke spigots
2. Quotation / Selection Drawing
 Specific proposed model, verified duty point, selected options Technical submittal review, consultant pre-approval Subject to revision if site conditions or electrical voltage changes
3. Approved Project Drawing
 Certified dimensional drawing, nozzle schedule, revision code, date Construction coordination, MEP clash detection, site installation The sole legally binding dimensional reference for manufacturing
04 / Request Protocol

Information Required for Drawing Requests

The drawing process is fastest when the equipment duty and configuration options have been narrowed to a real project build.
Engineering Handoff

10 Parameters for Accurate Drawing Requests

Send your project and schedule details. YONGFAN technical application specialists will generate verified dimensioned drawings and nozzle schedules.

1. Product Series & Proposed Model Code
2. Project Name, Country & Reference Code
3. Fan Discharge Angle (0°–270°) & Motor Side
4. VAV Inlet Size & Reheat Coil Option
5. YF-MOA Plenum Outlet Spigot Layout (RCP)
6. Filter Face Size, Depth & Frame Insert
7. Heat Exchanger 4 Temperatures & Capacity
8. Hydronic Skid Flow, Head & Available Space
9. Valve DN, Body Type & Actuator Height
10. Existing Photos / Nameplates for Retrofits
05 / Technical Q&A

HVAC Product Drawings Frequently Asked Questions

Answers to key questions regarding catalog drawings, fan curves, heat exchanger nozzle schedules, and YF-MOA plenum drawings.

What drawing should I request before placing an order?

Request the dimensioned product drawing corresponding to the exact proposed model. For custom equipment, request the project-specific configuration drawing and nozzle schedule.

Can I use a catalog drawing for construction?

Use it only if confirmed to match the exact supplied build. Custom dimensions, motor options, nozzle positions, and accessories require a project-specific approved drawing.

What drawings are available for YONGFAN ventilation fans?

YONGFAN pre-sales support includes dimensioned general arrangement drawings and aerodynamic performance curves for the selected fan series and discharge configuration.

Does YONGFAN provide heat exchanger nozzle drawings?

Yes. YONGFAN supplies certified technical drawings and nozzle schedules detailing nozzle DNs, flange standards, and vessel dimensions for project design and installation.

How is the YF-MOA plenum drawing created?

The YF-MOA is configured from diffuser count, diffuser positions, and paired YFVAV-S-T100 size. Matched configuration drawings and dimensions are provided with the quotation.

Do filter drawings need to show more than width and height?

Yes. Frame depth, insert thickness (20/45/65 mm), gasket/gel seal profiles, airflow direction, and replacement withdrawal access must be coordinated.

Are CAD and BIM files available for every product?

Format availability is confirmed per model. Where editable 3D/BIM geometry is unavailable, use the latest approved dimensioned drawing for spatial coordination.

Which drawing revision should the contractor use?

Always use the latest approved project revision matching the purchase order. Remove superseded drawings from site construction sets immediately.

Can YONGFAN change dimensions for a project?

Yes. Source documents support non-standard dimensions, custom fan casings, and bespoke plenum spigots upon technical confirmation.

What should I send if I need a replacement drawing?

Send existing model code, nameplate photos, serial number, measured opening dimensions, and the interface parameters you need to verify.

06 / Coordination Boundaries

Remove Assumptions Before Equipment Reaches Site

The best drawing is the one that resolves the interfaces the project team would otherwise have to guess.
Boundary 01 / Frozen Revisions

Revision Integrity

Never construct from superseded drafts. Keep quotation, technical confirmation, and drawing revision strictly aligned.

Boundary 02 / Service Access

Withdrawal Zones

A drawing must indicate component removal zones: filter access, plate pack opening, and U-tube bundle pulling.

Boundary 03 / Handing & Rotation

Discharge Angles

Always verify centrifugal discharge rotation and motor terminal box side before releasing drawings for production.

Boundary 04 / Nozzle Schedules

Confirmed Ports

Confirm nozzle DNs, flange pressure classes, and center-to-center distances before freezing connecting headers.

07 / Drawing Handoff

Request a Product Drawing

Send your equipment model number, duty point, or custom configuration details — YONGFAN application specialists will provide verified dimensioned drawings, nozzle schedules, and installation general arrangements.

Ventilation Fan GA & Performance Curves YFVAV-S-T100 & YF-MOA Matched Plenums U-Tube Storage HX Nozzle Schedules Plate Heat Exchanger Frame Dimensions Filter Fixing Frames & Cleanroom Ceilings 100X–900X Hydraulic Valve Dimensions
Request Product Drawing View BIM / CAD Files Contact Technical Support
Engineers reviewing HVAC general arrangement drawings and nozzle schedules
YONGFAN Technical Drawing Support
Dimensioned general arrangements, nozzle schedules & matched configuration drawings.
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