Flat underground fresh air duct system size 85×45mm
Price range: $0.81 through $3.61 ( Not real price )
85×45mm 3.0mm thick PVC flat underground fresh air duct & full fitting kit, low-profile buried ventilation pipe system for residential MVHR ground supply, complete elbows, tees, valves and plug accessories for balanced whole-house fresh air circulation under concrete floors.
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This is flat underground fresh air duct system material PVC, size 85×45mm 3.0mm thick, a complete modular ventilation kit including straight flat pipes and matching accessories (direct coupler, 45°/90° horizontal elbow, 90° wall-climbing elbow, tee joint, pipe clamp, air valve connector, air outlet fitting, plug cap, air distribution box adapter), designed for buried underfloor fresh air ventilation systems.
Core problems it solves
- Solves low ceiling / narrow floor cavity space limits: Flat 85×45 low-profile design fits under floor screed where round ducts cannot be buried.
- Fixes poor air distribution & uneven indoor air quality: Modular tees, elbows and valves enable balanced zone air supply for whole-house fresh air systems.
- Eliminates installation leakage & weak connection issues: Matching plug-in fittings create tight sealed joints without custom cutting.
- Resists underground moisture & corrosion: Rigid PVC material avoids rust, mold and water damage from concrete embedding.
- Resolves construction layout restrictions: Wall-climbing 90° bends route air vertically up walls without extra transition parts.
Core Product Information Table
| Item | Detailed Specs |
|---|---|
| Core Size | 85mm × 45mm flat rectangular cross-section |
| Pipe Wall Thickness | 3.0mm thickness |
| Pipe Length Options | 2m per piece, 14m (7pcs) as a pack |
| Material | Solid PVC |
| Mount Type | Underground buried / floor embedded installation |
| Full Fitting Range | Direct coupler, 45° horizontal elbow, 90° horizontal elbow, 90° wall-climbing elbow, tee joint, pipe clamp, valve connector, white air outlet fitting, blank plug cap, white air distribution box adapter |
| Core Function | Underfloor fresh air delivery, air circulation & indoor air quality improvement |
Product Features
- Low-profile flat 85×45 shape for underfloor buried installation, saves vertical space vs round ducts
- Heavy-duty 3.0mm thick PVC pipe wall, high compression resistance for concrete embedding
- Complete matching fitting ecosystem for full-system layout without custom adapters
- Smooth inner pipe surface to lower airflow resistance and reduce ventilation fan power consumption
- Corrosion, moisture and mold resistant PVC material, long service life under floors
- Plug-and-play assembly design, fast DIY or professional installation with zero gluing required
- Adjustable air flow via valve connector accessory for room-by-room airflow control
- Multiple pipe length specifications for flexible project measurement matching
- Fully sealed joint structure to prevent air leakage and maintain ventilation efficiency
- Lightweight rigid structure, easy transportation and on-site cutting
Application Scenarios
- New residential whole-house MVHR ground-supply fresh air systems: Buried under concrete floor screed to deliver fresh air to each bedroom/living room without visible ceiling ducts.
- Renovation apartments with ultra-low floor height: Cannot install large round ceiling ducts; flat buried pipes avoid ceiling height loss.
- Basement moisture ventilation projects: Buried flat ducts circulate dry outdoor air to eliminate dampness and mold.
- Small office open-plan ventilation layout: Route hidden under raised floors to supply fresh air to multiple work zones via tee splitters.
- Villa ground-floor silent fresh air solutions: Underground ductwork reduces airflow noise transmitted to living spaces compared to ceiling-mounted ducting.
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