Glass fiber airduct with coated interior surface containing a biocide

• US 5,487,412 A
• Filed: 11/09/1994
• Issued: 01/30/1996
• Est. Priority Date: 05/26/1993
• Status: Expired due to Term

• Current Assignee: Schuller INternational, Inc. (Berkshire Hathaway Incorporated)
• Original Assignee: Schuller INternational, Inc. (Berkshire Hathaway Incorporated)
• Inventors: Gamboa, Ricardo R., Schakel, Eric G., Matthews, Kent R.
• Primary Examiner(s): Bryant, III, James E.
• Application Number:
  US08/337,586
• Time in Patent Office: 447 Days
• Field of Search: 138/145, 138/140, 138/137, 138/149, 138/177, 138/178, 138/DIG. 2, 138/DIG. 4, 138/DIG. 6, 138/DIG. 7, 138/97, 138/146, 138/103, 427/236, 428/921
• US Class Current: 138/149
• CPC Class Codes: F16L 9/003 with a rectangular cross-section ducting arrangements in air-conditioning or ventilation F24F13/02
• CPC Class Codes: F16L 9/14 Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups F16L9/16 - F16L9/22 take precedence
• CPC Class Codes: F24F 13/0263 Insulation for air ducts
• CPC Class Codes: F24F 13/0281 Multilayer duct

Abstract

A rigid, glass fiber airduct for conveying an airstream has an interior surface, adapted to be in contact with the airstream, which is coated with a polymeric coating comprising an organic or inorganic biocide. The polymeric coating has a dry solids content between 10 and 20 grams per square foot of duct board surface and retains its abrasion strength and puncture resistance whereby the interior surface of the airduct can be cleaned by conventional industrial or commercial cleaning procedures while in service without exposing glass fibers to the airstream.

Claims

1. A glass fiber airduct for conveying an airstream comprising:

a rigid, glass fiber duct formed of duct board having a density of at least 3.5 pounds per cubic foot;

said glass fiber duct having an interior surface adapted to be in contact with an airstream;

said interior surface of said glass fiber duct having a polymeric coating layer comprising a polymeric coating of a surface of said duct board;

said polymeric coating having a dry solids content between 10 and 20 grams per square foot of said duct board surface;

said polymeric coating layer having an inorganic biocide to prevent microbiological growth on said interior surface of said glass fiber duct; and

said polymeric coating layer retaining its abrasion strength and puncture resistance after being subjected to a temperature of 250°

Fahrenheit for 60 days whereby said interior surface of said glass fiber duct can be cleaned without exposing glass fibers to the airstream.

2. The glass fiber airduct of claim 1, wherein:

said duct has a rectangular cross section.

3. The glass fiber airduct of claim 1, wherein:

said duct has a circular, oval or flat oval cross section.

4. The glass fiber airduct of claim 1, wherein:

said polymeric coating has a dry solids content between 12 and 16 grams per square foot.