asked the Chairman of Committees:

With what regularity air filters in those parts of the House of Lords with air conditioning are (a) inspected and cleaned, and (b) replaced.[HL8060]

Filter maintenance is managed by the Parliamentary Works Services Directorate using the House's computerised facility management system. The frequency of filter inspections and replacements is specified in the operation and maintenance manuals provided after the commissioning of new filter installations. The frequency of inspections is reviewed periodically based on reports about the condition of filters.

The Parliamentary Works Services Directorate carries out approximately 10,000 filter maintenance and replacement tasks per year across the parliamentary estate.