General service every year, filter change every 2 years
Pictured above: New filter sock on left (20% larger surface area than older models for enhanced performance) and recently replaced clogged-up filter sock on right. The filter socks are used with the Roof Heat Recovery Module, as well as with some Condensation Control Modules.
- If your Ducted Air Circulation System is 24 months old, then it is recommended to have an annual service.
- If your Ducted Air Circulation System is over 24 months old, then it probably requires a filter sock replacement. Sometimes our servicing staff recommend that the filter sock be changed earlier if it is looking particularly clogged. This depends on the air quality of your roof cavity.