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V. 1.3-24-04-19
brookvent.co.uk
T: +44 (0) 28 9061 6505
4.2 Ductwork and Connections
To comply with SAP Appendix Q, and to facilitate the air flow performance, all ducting
used should be rigid. If flexible ducting is required, it should be kept to an absolute
minimum of 300mm and kept taut as per the Domestic Compliance Guide (Part F: Eng
and Wales 2010).
The spigots on the Brookvent aircycle 1.3 systems are suitable for connection to 125mm
diameter round pipe.
The label on top of the unit clearly identifies which spigot should be connected to which
ducting route within the dwelling. This is also shown clearly within this manual.
For optimum efficiency and performance, it is recommended that 125mm diameter
round pipe is used (where possible) to connect to the spigots and continue throughout
the dwelling, this will assist in keeping pressure losses to a minimum. A minimum straight
vertical run of 300mm should also be used directly off each spigot (where possible).
Where it is not possible to continue throughout the dwelling in rigid 125mm diameter
round pipe due to the void spaces available, a conversion to rigid 204mm x 60mm flat
rectangular ducting is recommended. It is recommended that the number of bends in the
ducting system is kept to a minimum.
Each of the external roof terminals / wall terminals must be the equivalent to the open
area of 125mm diameter round pipe.
To facilitate air circulation within the dwelling there must be a minimum of 10mm
undercut on each of the doors (to the finished floor) within the dwelling (or grills placed
at low level on the doors).
Extract air valves should be placed in all wet rooms (kitchen, utility, en-suite, etc.) and
should be sited, where possible, close to the main source of humidity/ pollutant.
Fresh supply air valves should be placed in all habitable rooms (bedroom, living room,
dining room, etc.).
Air valves should be locked upon commissioning so that they are tamper proof.
Duct designs/ layouts should always be adhered to if provided.
The Domestic Compliance Guide: Eng. and Wales 2010 or relevant equivalent dependent
upon local guidelines, should be adhered to in terms of installation practices.
