| 21. | One of the men in the office remarked that the air filter needed changing.
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| 22. | A metal cylinder behind the carburetor held the air filter.
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| 23. | That air flow brings most of the flotsam and jetsam to to air filters.
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| 24. | If you have the type of air filter that can be cleaned, clean it.
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| 25. | But sand and dust clog engines and air filters and grind down helicopter blades.
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| 26. | For dusty environments MWM offered an oil bath air filter.
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| 27. | The air filter could be changed by opening the seat.
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| 28. | He switches on an air filter and lights up the first of many cigarettes.
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| 29. | Somebody got windshield wipers; someone else got an air filter.
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| 30. | An electric air filter hums in Gail Langsner's living room on the 12th floor.
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