Are de-aerators of Perspex construction permitted to be installed internally?
No, oil de-aerators of Perspex construction should be installed externally to a property as they are not deemed fire rated. Furthermore, they may vent vapours to atmosphere and can promote an explosive environment if sited within a confined space.
Oil de-aerators are available for internal installation. These are manufactured from fire resistant material and should be provided with a means of taking vented air to the outside via a fireproof vent pipe or releasing vapours via the burner.