SPUNSTRAND INDUSTRIAL FIBERGLASS REINFORCED DUCT

Capabilities List

• Watertight joints
• Direct burial
• Special shapes and sizes
• Complete line of pre-insulated or heavier wall thickness non-insulated fittings
• Pre-drilled duct for solar bed aeration
• Greater insulating values
• Factory manifolding
• Custom lengths
• Alternate joint systems
• Custom fittings, round or rect.
• Deep burial engineering square to round
• Consulting
• FRP boots

Spunstrand® fiberglass reinforced plastic duct (FRP) is rated Class 1 and code approved for direct underground burial serving any commercial application which has the supply and/or return air system under the building slab. Typical applications include the following.

Underslab HVAC/Slab on Grade Construction

• Banks
• Carbon Monoxide Exhaust
• Churches
• High Rise Construction
• Libraries
• Hotels
• Housing Projects
• Hospitals (HVAC & Garage Exhaust)
• Restaurants
• Schools/Gymnasiums
• Supermarkets
• Swimming Pools (HVAC & Heat Recovery Systems)
• Theaters/Auditoriums

Spunstrand® Inc. duct for these applications is manufactured using the filament wound method, where continuous fiberglass strands are impregnated with resin and machine wound on a mandrel which has first received a foil scrim kraft surface liner. Winding continues until the desired wall thickness is reached and then the mandrel with the duct laminate is moved to a heated curing station where it is rotated until the resin is set. The approximate glass content of the filament wound duct is 70%.

The internal surface liner provides the Class 1 rating for this product, while the fiberglass fibers furnish strength, dimensional stability, and temperature resistance. The type of resin is chosen to provide chemical and electrical resistance, color, finish hardness and thermal properties.