The Double Poly Air Inflation System is the industry-standard method for insulating polyethylene-covered greenhouses and polytunnels. Two separate layers of greenhouse poly film are installed over the structure with a small gap between them. A continuously operating low-wattage inflation blower maintains constant low-pressure air between the two layers, creating a stable, sealed air cushion that acts as a thermal barrier.
This dead air space significantly reduces thermal conductivity compared to a single-layer covering, lowering heating costs by up to 50% while also providing improved resistance to condensation drip and wind load stress on the structure.
Simple. Continuous. Effective.
Dual Layer Install
Two separate poly film layers are fitted over the greenhouse frame with a uniform gap maintained between them using channel and wiggle wire.
Blower Runs Continuously
A small low-pressure inflation blower runs 24/7, pumping air into the sealed cavity between the two poly layers via an inflation tube.
Air Cushion Forms
The pressurised air keeps the two layers separated and taut, forming a stable insulating cushion along the full length and width of the structure.
Heat Loss Reduced
The trapped air gap significantly reduces the U-value of the covering, cutting heating costs by up to 50% compared to single-skin poly.
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$289.00
Technical Specifications
| Parameter | Specification |
|---|---|
| System Type | Low-pressure air inflation, dual-layer poly |
| Inflation Blower Power | Typically 15W – 40W (depending on house size) |
| Operating Pressure | 0.5 – 1.5 inches water gauge (WG) |
| Air Gap (Between Layers) | 50mm – 100mm (2″ – 4″) typical |
| U-Value (Double Layer) | ~2.0 – 2.3 W/m²K (vs ~6.2 W/m²K single skin) |
| Estimated Heat Saving | Up to 50% reduction vs single-layer poly |
| Compatible Film Thickness | 150 micron (600 gauge) to 200 micron (800 gauge) |
| Compatible Film Types | Standard PE, thermal IR, anti-drip, diffused |
| Fixing System | Aluminium extrusion channel and wiggle wire |
| Inflation Tube Diameter | Typically 50mm – 100mm flexible ducting |
| Blower Power Supply | 240V AC, single phase (12V DC options available) |
| Blower Run Mode | Continuous 24/7 operation |
| Temperature Range | Suitable for −20°C to +50°C ambient |
| Structure Compatibility | Galvanised steel, aluminium, timber-framed greenhouses |
