• Metal Duct Reducers | Tin Vent Step-Down Adapter
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Metal Duct Reducers | Tin Vent Step-Down Adapter

£5.75
£5.75
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SIZE: 5">4"
Metal Duct Reducers (commonly referred to as tin duct reducers) provide a premium, seamless transition between different sizes of flexible or rigid ventilation pipework. Forged from heavy-duty steel treated with a protective zinc coating, these inline connectors optimize ventilation efficiency, maintain high airflow velocity, and easily withstand the humid environments of hydroponic grow rooms or commercial extraction setups.
Core Product Features
  • Corrosion-Resistant Galvanised Steel: Built with Sendzimir zinc-coated steel to offer absolute protection against rust, oxidation, and constant humidity exposure.
  • Concentric High-Flow Design: Tapered concentric architecture guarantees smooth, aerodynamic transitions that minimize static back-pressure and airflow turbulence.
  • Male Spigot Connectors: Precision-formed male ends slide effortlessly inside spiral ducting, extraction fans, carbon filters, or flexible hose lines.
  • Safety Rolled Edges: Features safe, rolled outer rims that protect hands during installation while adding critical structural rigidity to prevent crushing.
  • High Temperature & Pressure Tolerance: Fully rated to withstand high air volumes and structural heat loads, perfect for inline industrial or residential HVAC systems.
Available Size Variants & Specifications:
This range of single-piece structural step-downs is designed to eliminate the need for messy multi-stage adapters. Each variant is engineered with precise male tolerances to slip inside your existing ventilation components.

Duct Size (Imperial) Duct Size (Metric) Weight (kg) Primary Application
12" to 10" 315mm to 250mm 0.72 Steps large commercial intake or roof vents down to 10" filters.
12" to 8" 315mm to 200mm 0.78 Connects large extractors directly to standard 8" filters or wall outlets.
10" to 8" 250mm to 200mm 0.58 Standard piece to match a high-power 10" fan to an 8" filter array.
8" to 6" 200mm to 150mm 0.45 Transitions medium-large 8" fans down to 6" air-cooled lights or ducts.
6" to 5" 150mm to 125mm 0.32 Adapts standard 6" fan setups down to 5" flexible ducting or smaller tents.
6" to 4" 150mm to 100mm 0.35 Drops a 6" line to a 4" line for targeted air in propagation areas.
5" to 4" 125mm to 100mm 0.24 Joins 5" ventilation components or intakes to a 4" air circuit.

Technical Specifications Summary:
Specification All Variant Models
Material Base Industrial-Grade Galvanised Sheet Steel
Coating Type Sendzimir Process Zinc Layer (Rust Proof)
Connection Style Dual-Sided Male Spigot Ends
Duct Compliance Fabricated in accordance with DW144 standards
Max Temperature Up to 250°C structural stability
Airtight Class High-efficiency mechanical seal threshold
Installation & Fitting Advice:
Because sheet metal bodies hold their round shape permanently, they will not collapse under heavy tension. To ensure an airtight, rattle-free seal, secure the ducting over the male flanges using silver aluminium tape, heavy-duty jubilee clips, fast clamps, or self-drilling metal rivets.
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