I GENERAL

A. All round and flat oval duct systems shall be treated with a coating containing the AgION antimicrobial compound as supplied by Lindab, Inc (800) 797-7476 or approved equal. Rectangular duct shall be treated with a coating containing the AgION antimicrobial compound and supplied by the contractor.

II MATERIALS

A. All duct system components shall be manufactured using pre-coated steel treated with the AgION antimicrobial compound. Duct system components shall be manufactured from gauges defined in SMACNA's Duct Construction Standards - latest edition.

B. Antimicrobial compound shall have ionic silver as its active ingredient which is encapsulated in a zeolite matrix that provides a continuous controlled release. The antimicrobial compound shall be blended into an epoxy paint system.

C. Coating containing the antimicrobial compound shall have a hardness of 2H minimum when tested per ASTM D3363.

III APPLICATION

A. For AgION antimicrobial pre-coated steel products, the coating shall be uniformly applied by an authorized coil coater and shall have a minimum thickness of 0.1 mils. The interior surface of the finished duct shall be treated with the antimicrobial coating. An untreated clear coating shall be applied to the exterior surface of the duct. [If necessary, both surfaces of the ductwork shall be treated with the coating containing the AgION antimicrobial compound].

B. Gaps in the coating wider than ¼" shall be repaired in order to maintain product performance. Duct work supplier shall provide repair kits to the installing contractor.

C. A shopcoat containing the AgION antimicrobial compound shall be available for spray or brush application to facilitate on-the-job repairs.

D. The coating containing the AgION antimicrobial compound shall withstand temperatures not to exceed 350 F for an extended period of time.

IV REGULATORY

A. Antimicrobial compound shall be registered with:

1) Environmental Protection Agency (EPA) for use in HVAC systems.
2) Food and Drug Administration (FDA) as an acceptable additive in all food-contact polymers.
3) NSF Standard 51 approved for indirect food contact use in Food Zones and approved for use in Meat and Poultry Processing Equipment Product Zone.

B. Antimicrobial coated product shall be classified by an internationally recognized laboratory authority to conform to Standard 723 - not to exceed flame spread or smoke developed ratings of 25/50.

C. Antimicrobial coated product shall comply with ASTM B117 (salt spray testing), ASTM D2247 (condensing and humidity testing) and ASTM D870 (water immersion testing).

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