Combustion air fan for oil burner has at least one air regulating membrane formed from two movable parts, each with one aperture

摘要

The combustion air fan has at least one air regulating membrane (2), consisting of at least two parts (10, 11) movable relative to each other. Each part has at least one aperture (12, 13, 15, 16). The apertures of at least two parts can overlap. The size of the resulting aperture can be adjusted by moving one of the parts.