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Duct leakage testingNovember 2006

Airtight ductwork is one of the keys to a quality heating and cooling system. It helps to make the building healthy, comfortable and energy efficient.

Although sealing up ductwork sounds simple, leakage problems are major concern in todays duct construction market.

Leaky ducts can significantly increase energy bills, dramatically reduce system capacity and performance, as well as result in potentially dangerous indoor air quality problems. Duct leakage is often responsible for complaints about indoor comfort by building occupants.

Independent testing to DW / TM1 prior to installation

The only way to ensure that the ductwork is airtight is by testing it. Laboratory or witness testing by an independent third party can assess product performance and provide evidence that equipment is fit for use thus minimising problems on site.

BSRIA in Dubai

The Dubai based manufacturer and supplier Alpha Duct, a company of ETA-Ascon Group, contracted BSRIA as an independent body to carry out pressure testing of their pre-insulated ducts. The products are intended for use on various construction projects in Middle East and the objective was to verify their performance prior to installation.

The Alpha Duct System is supplied as Phenolic and PIR foam which is light in weight, easy to handle, and makes a good insulator.

BSRIA tested different sample types in each category with different joint systems: an invisible aluminium flange joint and male/female joint, in accordance with Class C of DW 144.

Certification for Alpha Duct products

At the completion, certificates were issued with details of the joint ratings, material characteristics and the measured air leakage rate. The product met the leakage requirements for a Class C.

Sameer Kohli, Divisional Manager, of Alpha Duct says: "With the exemplary vision of our group management and outstanding work of all my team members, Alpha Duct is reaching to new heights of its business. We supply the duct work for some prestigious construction projects in Dubai, Abu Dhabi and Qatar including: Jumeirah Beach Residences, Burj Dubai Residences, Mall Of Emirates, Liwa Village, Al Dafna Towers and Qatar Gas Camp. Therefore it is critical to prove before hand that the product is fit for purpose. BSRIA independent test results give us confidence in our product and provide evidence to our clients and consultants that the product will perform as intended for its use in accordance with the standards. We would like to thank BSRIA for being there for our ductwork air tightness testing and we wish them success in all their services to the industry."

For on-site or laboratory duct testing, certification and installation solutions, contact:

BSRIA Test & Certification
Tel: +44 (0)1344 465600
or Email:



Airtightness testing, consultancy and support service for all types of buildings