What is this substance going through air filter?

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When I removed an air filter recently I noticed it had this a glue like substance going across it as you can see in the picture. It must have either come like that or the mechanic put it on.



Just wondering what is the reason for putting this on? Is this an anomaly or do lots of air filters come like this?
enter image description here






air-filter







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    up vote
    2
    down vote

    favorite












    When I removed an air filter recently I noticed it had this a glue like substance going across it as you can see in the picture. It must have either come like that or the mechanic put it on.



    Just wondering what is the reason for putting this on? Is this an anomaly or do lots of air filters come like this?
    enter image description here






    air-filter







    share|improve this question























      up vote
      2
      down vote

      favorite









      up vote
      2
      down vote

      favorite











      When I removed an air filter recently I noticed it had this a glue like substance going across it as you can see in the picture. It must have either come like that or the mechanic put it on.



      Just wondering what is the reason for putting this on? Is this an anomaly or do lots of air filters come like this?
      enter image description here






      air-filter







      share|improve this question













      When I removed an air filter recently I noticed it had this a glue like substance going across it as you can see in the picture. It must have either come like that or the mechanic put it on.



      Just wondering what is the reason for putting this on? Is this an anomaly or do lots of air filters come like this?
      enter image description here






      air-filter




      air-filter






      share|improve this question













      share|improve this question











      share|improve this question




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      asked Sep 8 at 23:32









      James Wilson

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          Many air filters come like that. It's a line of glue, used to keep the pleats in the filter at the correct spacing. Not needed on smaller air filters.






          share|improve this answer




















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            active

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            up vote
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            down vote



            accepted










            Many air filters come like that. It's a line of glue, used to keep the pleats in the filter at the correct spacing. Not needed on smaller air filters.






            share|improve this answer
























              up vote
              3
              down vote



              accepted










              Many air filters come like that. It's a line of glue, used to keep the pleats in the filter at the correct spacing. Not needed on smaller air filters.






              share|improve this answer






















                up vote
                3
                down vote



                accepted







                up vote
                3
                down vote



                accepted






                Many air filters come like that. It's a line of glue, used to keep the pleats in the filter at the correct spacing. Not needed on smaller air filters.






                share|improve this answer












                Many air filters come like that. It's a line of glue, used to keep the pleats in the filter at the correct spacing. Not needed on smaller air filters.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Sep 9 at 0:24









                PeteCon

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