
(1) Open access door
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(2) Loosen and remove hold-down knobs
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(3) Remove air distribution tubes
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(4) Remove retainers and venturies
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(5) Slide out filter elements
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(6) Wash or blow off filter elements
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(7) Replace elements
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(8) Replace venturis and hold retainers
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(9) Replace air distribution tubes
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(10) Close access door
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