The air pressure switch is a safety device which checks the fan is fully operational. It ensures that, if the fan fails within the boiler, there would not be a build up of dangerous gasses with no means of diverting them out of the property. The printed

Brand Name	Ariston
Colour	Grey
Material	N/A
Manufacturer Model No	61307335-01
Wear Type	N/A
Type	Air Pressure Switch
Certifications Met	N/A
Country of Origin	N/A
Protects From	N/A
Waterproof	N/A
Number of Pockets	N/A
Waist Size	ad18cg24fw
Toilet Cistern Capacity	FTW
ERP Rating	Not Applicable
Supplier Part Number	61307335-01