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What We Do

Pheasants International provides duct leakage testing services in Pakistan for commercial, industrial, healthcare and pharmaceutical projects.
A duct leak test pressurizes an isolated section of ductwork with a calibrated fan and orifice, measures the airflow needed to hold that pressure, and compares the leakage rate against the class the specification demands.
Leakage is invisible on site and expensive for the life of the building. Air that escapes before the terminal was still paid for at the fan, and a system that cannot hold pressure will never balance to design.

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Benefits

  • Leakage quantified against a class, not estimated by eye
  • Defects found while ducts are accessible — before insulation and ceilings close
  • Balancing becomes achievable — terminals cannot reach design flow through leaking ductwork
  • Fan energy reduced — leakage is continuous waste at every operating hour
  • Specification compliance evidenced — a documented pass against the stated leakage class
  • Room pressure control protected — critical for cleanrooms and isolation areas
  • Sectional results — leaking runs identified rather than condemning the whole system

How we work

Review

Specification leakage class, test pressure and percentage of ductwork to be

Isolate

Seal the section under test at every opening and branch

Pressurise

Bring the section to test pressure with a calibrated leakage rig

Measure

Record leakage airflow and calculate the rate against duct surface area

Locate

Trace and mark leakage points on failing sections

Retest

Verify sealed sections after remedial work

Report

Leakage rate, class achieved, pass or fail and marked-up drawings

  • Duct leak testing at low, medium and high pressure
  • Duct air leakage testing (DALT)
  • Supply, return and exhaust duct testing
  • Duct pressure testing for leakage
  • Cleanroom and pharmaceutical ductwork testing
  • Kitchen and car park extract duct testing
  • Smoke control duct leakage testing
  • Leakage location and marking
  • Post-remedial retesting
  • Leakage class certification
  • Pre-insulation testing during construction
  • SMACNA HVAC Air Duct Leakage Test Manual ·
  • DW/144
  • · EN 12237
  • · EN 1507
  • · ASHRAE 90.1 leakage classes

  • Pharmaceutical manufacturing

  • Hospitals and healthcare

  • Cleanrooms and controlled environments

  • Data centers

  • Commercial towers and offices

  • Hotels

  • Shopping malls

  • Industrial plants

  • Laboratories

  • Calibrated leakage rigs
  • with current certificates for every test
  • Testing scheduled before insulation and ceilings so defects stay reachable
  • Sectional isolation — failures traced to the run, not blamed on the system
  • Retesting included after remedial sealing
  • TAB capability in-house — the same team that tests leakage balances the system
  • Nationwide delivery across Pakistan

Frequently Asked Questions

What is a duct leak test?

A duct leak test pressurizes an installed section of ductwork to a specified test pressure and measures how much air escapes. The measured leakage is compared against the leakage class stated in the project specification to give a pass or fail result.

Which company provides duct leakage testing in Pakistan?

Pheasants International provides duct leakage testing across Pakistan to SMACNA, DW/144 and EN 12237 procedures for commercial, industrial, healthcare and pharmaceutical projects.

When should ductwork be leakage tested?

Before insulation is applied and before ceilings are closed, while joints remain accessible for sealing. Testing after enclosure turns a simple repair into a demolition exercise.

How much of the ductwork needs to be tested?

This is set by the specification. Many projects require a representative percentage of total duct area, with failure triggering testing of additional sections.

What happens if a duct section fails the test?

Leakage points are traced and marked, the contractor seals them, and the section is retested. Both the original and final results appear in the report.

What is an acceptable duct leakage rate?

Acceptable leakage is defined by the leakage class in your specification rather than a single universal figure. The class sets a maximum leakage per square metre of duct surface at a stated test pressure.