Sheet metal ducting plays a crucial role in HVAC systems by ensuring proper air distribution, ventilation, and indoor comfort. To achieve reliable performance and long service life, every stage—from material procurement to fabrication, installation, and final testing—must be carefully inspected and controlled.
This Inspection and Test Plan for HVAC Sheet Metal Ducting outlines the systematic checks, acceptance criteria, and responsibilities required to ensure that the ducting works comply with approved drawings, relevant standards, and project specifications.
WHAT IS AN INSPECTION AND TEST PLAN (ITP)
Inspection and test plans, as well as checklists, are integral parts of quality management systems — not only in construction, but in almost every industry where Quality Management Systems (QMS) are implemented.
They are considered master documents that monitor and record the various parameters and activities of a process. These records later play a vital role during verification and auditing.
In construction, where numerous trades and activities must be completed — such as structural, finishes, façade, electrical, mechanical, and plumbing works — preparation and implementation of different ITPs form a crucial part of the project quality management system.
To read more about ITPs and how to prepare one, CLICK HERE and refer to the last picture in this post for a quick understanding of an ITP’s structure and how to align it with your project requirements.
INSPECTION AND TEST PLAN FOR SHEET METAL DUCTING WORKS
SECTION 1 – DOCUMENTATION REVIEW
This section outlines the review and approval process for all necessary documents before commencing on-site floor tiling works.
Key documents include:
- Detailed shop Drawings including section elevation
- Method Statement
SECTION 2 – SAMPLE APPROVAL
This section outlines the review and approval process for all necessary documents before commencing work on-site.
Key documents include:
- Sample approval
- Technical Data’s of manufacture
SECTION 3 – INSPECTION OF INCOMING MATERIALS & STORAGE
This section addresses the inspection of materials used upon delivery.
- Fabrication & storage
yard - Storage of materials
- Sheet metal ducting
( Exhaust ducting, Volume, Smoke and Fire dampers, Louvers) - Gasket & Supports & duct flanges
SECTION 4 – PRE-WORK INSPECTION
This section focuses on inspections to be carried out before the Ducting work begins to ensure all prerequisites are met
Checks include:
- Check on the make of materials
- Fabrication of MS structural support to fix the duct
- Check on the Route of the Ducting layout and location for supports
SECTION 5 – WORK IN PROGRESS INSPECTION
During the Ducting work in progress, regular inspections are conducted to ensure that the work meets acceptable quality standards.
Checks typically include:
- Check on sheets during fabrication
- Check on size of ducts
- Check for supports
- Check on transverse joints
- Check on flexible connectors
- Check on duct attachment
- Fix the Fabricated Duct and check for alignment
- Check on girth angles and companion flanges
- Check on flanged joints
- Check on taper ducts
- Check for ducting for acoustic insulation
- Check for(proper) joints (Flange, Slip)
- Check on turning vanes
- Check on splitter dampers
- Check on Louvre dampers
- Check on fire dampers
- Check on penetrations
- Check on test probes
SECTION 6 – POST-WORK INSPECTION
After work is completed, an inspection ensures that the finished work/area for
Checks include:
- Check for bolt tightness / Air tight seal in joints
- Testing and Commissioning
Click here to understand what an ITP is and prepare one
Sign up below to download the full customizable Inspection and Test Plan (ITP) for Ducting Work and checklist in Word format.
Refer to this picture to learn tips on how to customize the ITP depending on Project Requirements
