Roll filter
Illustrated Guide to Ventilation (BG 2/2009), compiled by Kevin Pennycook and published by BSRIA in 2009, states: ‘A roll filter comprises a roll of filter medium which is fed across the face of a filter frame, while the dirty medium is rewound onto a roll at the bottom. When the roll is exhausted the complete dirty roll is disposed of and a replacement installed. The medium is usually of fibre with a viscous coating. Alternatives are dry media or metal mesh panels linked into a continuous curtain that intermittently passes through an adhesive (oil bath) reservoir. Roll filters do not have a positive sealing mechanism, so there is the risk of by-pass of unfiltered air.’
--BSRIA
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