Airflow Aventa 100 Silent Inline Fan – AVS100 duct_length_less_than_3m These units work on a

These units work on a calendar timer basis and simply changing the filters will still present the same issue as the heat recovery unit has to be told by the user when the filters have been changed

QT120B 120mm Basic fan (no delay) choice of two speeds wall or ceiling fan with discreet white front cover

blocking will occur every 6 - 12 months depending on the location (near busy roads or inner city areas tend block more quickly than remote country settings)

Centrif Duo Plus P (Pullcord) 2 Speed Centrifugal Kitchen & Utility Room Fan and Large Bathrooms

Pull Cord with Timer overrun Module

Airflow Aventa 100 Silent Inline Fan – AVS100 duct_length_less_than_3m These units work on a100mm diameter High pressure handling 2 speed fan High capacity 170 240m3 hr 24 29 dBA IPX4 Rated 3 year warranty SKU: 90000358