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US 6,641,648 B2Granted
Passive filtration system
AssigneeFoster-Miller, Inc.
InventorsDavid H. Walker, Edward Godere, Harris Gold, R. Edwin Hicks, Robert Kaiser
Life of this patent
Estimating the term…
Abstract
A filter system including a housing with an intake and an outlet, a pleated carbon filter disposed between the intake and the outlet for filtering out vapors entering the intake, and a hydrophobic solution dispersed about the pleated carbon filter to inhibit adsorption of water thereby increasing the adsorption capacity of the pleated carbon filter especially in high relative humidity environments. The hydrophobic solution is selected so that it does not decrease the adsorption capacity of the carbon filter. Also disclosed is a method of making such a filter.
Claims47
A filter system for passive filtration, the system comprising:
- a housing including an intake and an outlet;
- an active carbon filter disposed between the intake and the outlet for filtering contaminants entering the intake;
- the active carbon filter treated with a hydrophobic solution that inhibits adsorption of water vapor and enhances adsorption of a first set of chemical contaminants as compared to an active carbon filter without the hydrophobic solution in an environment having a relative humidity substantially above zero percent;
- and
- the active carbon filter treated with a second solution that enhances adsorption of a second set of chemical contaminants in an environment having a relative humidity at or above zero percent.
2 more elements
A filter system for passive filtration, the system comprising:
- a housing with an intake and an outlet;
- a pleated active carbon filter made of carbon felt material disposed between the intake and the outlet for filtering out vapors entering the intake;
- and
- a hydrophobic solution including polyalkosysilane (AEM 5700) dispersed about the pleated active carbon filter.
1 more element
A filter system for passive filtration, the system comprising:
- a housing with an intake and an outlet;
- a pleated active carbon filter disposed between the intake and the outlet for filtering out vapors entering the intake;
- a hydrophobic and anti-microbial solution dispersed about the pleated active carbon filter that includes polyalkosysilane (AEM 5700);
- a second solution dispersed about the pleated active carbon filter that includes one or more reactive metals;
- a gas absorbing solution dispersed about the pleated active carbon filter that includes triethylenediemine (TEDA);
- a high efficiency particle filter disposed adjacent the intake opening of the housing for filtering aerosols before they enter the intake;
- and
- a blower disposed at the outlet of the housing to increase the flow through the intake.
5 more elements
A room equipped with a filter system comprising:
- a plurality of tiles forming a ceiling;
- and
- select tiles replaced with passive filters each including:
- a housing with an intake facing the room and an outlet opposing the intake,
- a pleated active carbon filter disposed between the intake and the outlet for filtering out vapors entering the intake,
- a hydrophobic solution dispersed about the pleated active carbon filter that inhibits adsorption of water vapor and enhances adsorption of a first set of chemical contaminants as compared to an active carbon filter without the hydrophobic solution in an environment having a relative humidity substantially above zero percent, and
- a second solution dispersed about the pleated active carbon filter that enhances adsorption of a second set chemical contaminants as compared to an untreated active carbon filter in an environment having a relative humidity at or above zero percent.
4 more elements
A room equipped with a filter system comprising:
- a plurality of tiles forming a ceiling;
- and
- select tiles replaced with passive filters each including:
- a housing with an intake facing the room and an outlet opposing the intake,
- a pleated active carbon filter disposed between the intake and the outlet for filtering out vapors entering the intake,
- a hydrophobic solution dispersed about the pleated active carbon filter that inhibits adsorption of water vapor and enhances adsorption of a first set of chemical contaminants as compared to an active carbon filter without the hydrophobic solution in an environment having a relative humidity substantially above zero percent,
- a second solution dispersed about the pleated active carbon filter that enhances adsorption of a second set chemical contaminants as compared to an untreated active carbon filter in an environment having a relative humidity at or above zero percent, and
- a blower disposed at the outlet of the housings of selected filters to increase the flow therethrough and to generate a pressure above the ceiling greater than the pressure below the ceiling.
5 more elements
A method of making a passive filtration system, the method comprising:
- treating an active carbon filter material with a hydrophobic solution that inhibits adsorption of water vapor and enhances adsorption of a first set of chemical contaminants as compared to an active carbon filter without the hydrophobic solution in an environment having a relative humidity substantially above zero percent;
- treating the active carbon filter with a second solution that enhances adsorption of a second set of chemical contaminants as compared to an untreated active carbon filter in an environment having a relative humidity at or above zero percent;
- and
- pleating the active carbon filter material and disposing it in a housing to form a filter.
1 more element
Dependencies are inferred from the claim text.