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Dr. Jeffrey E. Terrell, director of the Michigan Sinus Center, demonstrates how to build an air purifier with a HEPA filter for about $25 with parts from your local hardware store.

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Dr. Jeffrey E. Terrell, director of the Michigan Sinus Center, demonstrates how to build an air purifier with a HEPA filter for about $25 with parts from your local hardware store.

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Dr. Jeffrey E. Terrell, director of the Michigan Sinus Center, demonstrates how to build an air purifier with a HEPA filter for about $25 with parts from your local hardware store.

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Dr. Jeffrey E. Terrell, director of the Michigan Sinus Center, demonstrates how to build an air purifier with a HEPA filter for about $25 with parts from your local hardware store.

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Dr. Jeffrey E. Terrell, director of the Michigan Sinus Center, demonstrates how to build an air purifier with a HEPA filter for about $25 with parts from your local hardware store.

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Dr. Jeffrey E. Terrell, director of the Michigan Sinus Center, demonstrates how to build an air purifier with a HEPA filter for about $25 with parts from your local hardware store.

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Dr. Jeffrey E. Terrell, director of the Michigan Sinus Center, demonstrates how to build an air purifier with a HEPA filter for about $25 with parts from your local hardware store.