B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 46/42 (2006.01) B01D 46/44 (2006.01)
Patent
CA 2334294
Disclosed is a change indicator (30) for a filter (10) for use in a gaseous circulation system, such as a forced air heating and cooling system. The change indicator includes an air impervious patch (32) that is secured to the filter. The portion of the filter media (12) adjacent to the change indicator changes appearance in response to the accumulation of contaminants at a much slower rate than the remainder of the air filter. The accumulation of contaminants progresses inwardly from the region adjacent the periphery of the change indicator towards the region adjacent to the center. Once the appearance of the filter media beneath the change indicator fully changes from periphery to the center, that is an indication that the air filter is in need of cleaning or replacement.
L'invention concerne un témoin (30) de changement pour un filtre (10) destiné à être utilisé dans un système de circulation de gaz tel qu'un système de chauffage et de refroidissement à air pulsé. Le témoin de changement comprend une pastille (32) imperméable à l'air, fixée au filtre. La partie du milieu filtrant (12) adjacente au témoin de changement change d'aspect en réponse à l'accumulation de contaminants à un rythme beaucoup plus lent que dans le reste du filtre à air. L'accumulation de contaminants progresse vers l'intérieur depuis la région adjacente à la périphérie du témoin de changement vers la région adjacente au centre. Lorsque l'aspect du milieu filtrant au-dessous du témoin de changement change complètement de la périphérie vers le centre, ceci constitue une indication que le filtre à air doit être nettoyé ou remplacé.
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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