SECTION 15815

NON-METAL DUCTS

PART 1 GENERAL

1.1	SUMMARY

A.	Includes But Not Limited To

1.	Furnish and install supply air branch duct runouts to diffusers as described in Contract Documents.

B.	Related Sections

1.	Section 15051 - General Mechanical Requirements

PART 2 PRODUCTS

2.1	COMPONENTS

A.	Ducts

1.	Formable, flexible, circular duct which shall retain its cross-section, shape, rigidity, and shall not restrict air flow after bending.

a.	Liner - Heavy coated fiberglass cloth fabric

b.	Helix - Corrosion resistant galvanized steel

c.	Insulation - Nominal 1-1/2 inches thick, 3/4 lb/cu ft density fiberglass insulation with air-tight, polyethylene or polyester core, sheathed in seamless vapor barrier jacket factory installed over flexible assembly.

2.	Assembly, including insulation and vapor barrier, shall meet Class I requirement of NFPA 90A-1989 and be UL 181 rated, with flame spread of 25 or less and smoke developed rating of 50 or under.

3.	Approved Model And Manufacturer -

a.	Type 4m Insulated by Flexmaster USA Inc.

B.	Cinch Bands - Nylon, 3/8 inch wide, removable and reusable type.

2.2	FABRICATION

A.	Liner shall be mechanically locked to helix during helix forming process.

PART 3 EXECUTION

3.1	INSTALLATION

A.	Install duct in fully extended condition free of sags and kinks, using 6 foot maximum lengths.

B.	Make duct connections by coating exterior of duct collar for 3 inches with duct sealer and securing duct in place over sheet metal collar with specified cinch bands.

END OF SECTION