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OUR SERVICESA home's health, security, convenience, and productivity are all enhanced by proper duct insulation.

Because the tensions inside the ventilation system are substantially higher than that in the house's external air so when the air handler is functioning, insulating the ducts is far more vital than sealing the structure of the building.

The differential in pressure is what propels the air handler.

A gap or fissure in the wall does not mean infiltration and there is no air discharge through the external walls. Because ductwork is continuously under pressure, a hole in the ducting is always a leak.

Since duct leaks it does not achieve the expected proportion of air supply to support the design load for a room, duct leaks often harm comfort. Rooms at the end of long duct lines are the most susceptible: distance a room is from the fan, the more likely it is that air would escape through a hole rather than getting where it’s supposed to. Leaks on the returning side of the system attract ambient air and hot attic air further into system, reducing efficiency even more. Pollutants, moisture, and mould spores may be carried in the airflow from a subfloor, which can be drawn into the returning leak and then transmitted through the supply side towards every room in the house.

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Two ways to determine duct leaks are :

LTO :leakage to the outside which only determines air leaks into attics or crawl spaces

and

TDL: total duct leakage determines air leaks into all the equipped areas of a building.

A duct leak testing process is pressurising the duct system using a regulated fan while continuously monitoring the air circulation throughout the unit and its impact upon that duct system’s pressure. Therefore the less air you require from the fan to force a shift in duct load, the tougher the duct system is. Just duct gaps that are linked to the outside could be measured, or overall duct air emission can be measured (i.e. leaks connected to the outside and inside of the house).

Leaks can put a great pressure on the HVAC system and can lose the conditioned air from the ducts resulting in an inefficient air flow. Therefore performance testing and diagnosis of the ducts is a must.