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An underfloor ventilation system for block and beam and timber floors. •Expands up to 5 brick courses. •Prevents damage by condensation and the build-up of dangerous gases. •For use with Rytons Multifix® Air Brick MFAB. Size: 218mm W x 250mm D x 368mm H All product imagery is for illustration purposes only. Appearance and colours are often affected by your display settings and therefore, should not be used for matching purposes.