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JFM ‘Heavy Duty’ Twin and Multi Span Range
The JFM ‘Heavy Duty’ twin and multi spans come in a variety of standard bay widths suitable for all commercial nurseries. All JFM polytunnel frames are made from large diameter Galvanised Steel which offers yield strengths up to 413N/mm2 and tensile strengths up to 517N/mm2 combined with a unique triple layer of corrosion protection (99.9% zinc, chrome conversion coating, and clear polymer top coat) All structures incorporate straight sides for improved access & air circulation, and our unique ‘heavy duty’ welded locking brackets. Standard structures are supplied with heavy galvanised steel ‘walk in’ gutters, pressure treated timber goalpost end frames and a cover tensioning system. A wide variety of options are available: end doors/ventilation, base cladding rails, side curtain ventilation systems, aluminium cladding rails, cross braces (crop bars) etc.
Specifications of the standard twin and multi spans are.
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Bay Width
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6.4m (21ft)
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8m (26ft)
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8.5m (28ft)
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Apex height
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3.2m
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3.8m
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3.5m
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Lintel height
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2.1m
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2.1m
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2.1m
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Goalpost width
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5.8m
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7.0m
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7.3m
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Straight side
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1.7m
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1.8m
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1.7m/0.9m
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Hoop Æ
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50mm
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60mm
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60mm
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Ridge, brace & gutter post Æ
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50mm
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50mm
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50mm
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Steel gutter thickness
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1.6mm
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1.6mm
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1.6mm
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End timbers
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75x75mm
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75x75mm
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75x75mm
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Hoop centres (standard)
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2.44m
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2.44m
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2.1m
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Cover inner bay
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7.3m
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9.2m
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11.1m
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outer bay (trenched)
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11.1m
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14.0m
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14.0m
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Structures all incorporate the following features:
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Feature
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Benefit
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High tensile structural tubular steel framework
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Stronger and more durable
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Fully galvanised steelwork
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Protection against corrosion
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Straight sided hoop profiles
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Improved access and air circulation
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Variable hoop centres
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Adjustable to all site conditions
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Welded ring locking brackets
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Strong solid fixing system
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Tanalith timber end & base frames
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Strong, durable and simple to use
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Choice of different covers
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Suitable for all climates
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Optional cross bracing / side purlins
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Additional strength for snow loads
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