• 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: 5inch-4inch
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.
12" to 10" Reducer (315mm to 250mm)
  • Unit Net Weight: 0.72 kg
  • Application: Ideal for stepping down commercial-grade main intake lines or high-volume roof ventilation down to standard 10" filtration systems.
12" to 8" Reducer (315mm to 200mm)
  • Unit Net Weight: 0.78 kg
  • Application: Bridges large-diameter grow room extractors directly to standard 8" carbon filters or wall outlets with a single fitting.
10" to 8" Reducer (250mm to 200mm)
  • Unit Net Weight: 0.58 kg
  • Application: A standard hydroponic transition piece used to match a high-power 10" intake or exhaust fan directly to an 8" filter array.
8" to 6" Reducer (200mm to 150mm)
  • Unit Net Weight: 0.45 kg
  • Application: Transitions medium-large 8" grow room extractions down to a standard 6" air-cooled lighting reflector or flexible duct line.
6" to 5" Reducer (150mm to 125mm)
  • Unit Net Weight: 0.32 kg
  • Application: Adapts standard 6" fan setups down to 5" flexible air ducting lines or smaller extraction tents cleanly.
6" to 4" Reducer (150mm to 100mm)
  • Unit Net Weight: 0.35 kg
  • Application: Drops a 6" main line directly down to a small 4" utility line, ideal for running targeted air distribution to propagation areas.
5" to 4" Reducer (125mm to 100mm)
  • Unit Net Weight: 0.24 kg
  • Application: A lightweight tin fitting perfect for joining 5" ventilation components or active intakes to a standard 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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