The external air kit facilitates the input of external air directly into the combustion chamber. Kit includes 1.5m x 100 aluminium ducting , jubilee clip and external teracotta grill.
Suitable for Harmony 23, 33, Stanford 23, 33 models
It is not completely room sealed and therefore should not be used with heat recovery systems or forced fan ventilation systems.
It is designed to reduce the chances of draughts in the room that a fresh air vent in the wall can cause.