There are a number of options for ducting materials for HRV systems in the residential application. Traditionally commercial ducting was generally completed with steel. This consisted of a helicaly wound steel pipe, generally referred to as spiro, and custom made rectangular duct with specially flanged joints. This type of duct is not suitable for residential ventilation mainly due to cost and practicality. Spiro can be used as it is available in small enough sizes to be practical for the application. As the HRV system is built in as an integral part of the house, it is necessary to think of the ducting in terms of its life-cycle. For this reason our opinion is that plastic is a good option, as it will outlive most other building components, plus it is highly cost-effective.
This duct can be in varying cross-sectional forms such as round (generally 100mm diameter) and rectangular (commonly 204x 60mm) but we in Proair Systems have a preference for an Oval alternative to both of these.
The important things to take into consideration when specifying ducting systems are that they are (a) appropriately sized, and (b) smooth on the inside, and hence will not create undue resistance to air movement.
The advantages of the oval section ducting are:
- It has similar airflow characteristics to its circular cousin.
- Because of the low profile (60mm) there is no need to change section to come down in a partition.
- It is available in more suitable sizes, and is therefore more versatile and easier to install than rectangular.
- It can be installed in an under-ceiling service cavity and remain within the air-tight envelope for higher efficiency and an easier install.
Click here to download our brochure for our new Duct & Joint ducting system.