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Cleanroom Air Distribution Systems
High-Temperature Double-Wall Exhaust Duct
A modular double-wall exhaust system with a 316L stainless inner liner, mineral-fiber insulation and stainless outer casing for hot dry process air.
- 316L Stainless Inner Liner
- Integrated Mineral-Fiber Insulation
- Double-Wall Modular Body
- Up to 600°C Dry Service
Product Introduction
High-temperature double-wall exhaust duct contains hot dry process gases within a welded stainless inner liner while mineral-fiber insulation reduces heat transfer to the external casing. Straight cylindrical modules connect with precision male-female ends, high-temperature seals where appropriate and external locking bands. The inner column can expand relative to the outer shell, limiting thermal stress through long routes. The system is suited to ovens, sterilizers, generators and selected industrial exhaust sources where conventional HVAC sheet duct and insulation are inadequate.
Key Features
Mineral-fiber insulation lowers outer-wall temperature and limits heat loss from the conveyed exhaust.
Modular locking-band joints allow sections, bends and access components to be assembled without broad field welds.
Independent inner-wall movement accommodates thermal expansion along extended exhaust routes.
Customer Product Concerns
A hot exhaust route must contain temperature and pressure while allowing thermal growth and keeping adjacent surfaces within a manageable heat exposure.
Single-wall duct radiates excessive heat into the mechanical space.A mineral-fiber layer separates the hot inner liner from the stainless outer casing.
Rigid joints crack when a long duct line expands during heat-up.The modular inner column is detailed to expand without forcing the outer support shell.
Ordinary elastomer gaskets degrade at process exhaust temperature.Metallic or selected high-temperature joint seals match the actual dry-service temperature.
Thin carbon-steel duct oxidizes rapidly in hot humid exhaust.A welded 316L inner gas path resists heat and a broader range of condensate exposures.
Typical Applications
Industrial oven exhaustSterilizer hot-air dischargeGenerator and engine exhaustHigh-temperature process ventilationCommercial kitchen exhaust risers
Technical Parameters
Representative construction ranges for modular high-temperature double-wall exhaust duct are shown below.
| Core Material | High-temperature mineral-fiber insulation between stainless steel walls |
|---|---|
| Panel Thickness | 25–50 mm insulation thickness |
| Effective Width | 100–1200 mm nominal internal diameter |
| Maximum Length | 1000 mm per standard modular straight section |
| Steel Facing Thickness | 0.6–1.0 mm 316L inner liner and 0.5–0.7 mm 304 outer casing |
| Core Density | 100–180 kg/m³ high-temperature mineral fiber |
| Thermal Conductivity | 0.040–0.060 W/(m·K), depending on insulation and mean temperature |
| Surface Finish | Bright or brushed stainless inner liner with stainless outer casing |
| Joint Type | Male-female modular socket with temperature-rated seal and external locking band |
| Customization | Available based on the intended application and operating environment. |
Available Options
25 mm or 50 mm mineral insulation304 or 316L outer casingPressure-tight sealing systemElbows, tees, drains and inspection modules
Planning a High-Temperature Double-Wall Exhaust Duct specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
