SPIROLOC is a light weight sheet metal tubing, which is machine made in a spiral form from metal strip coil stock. Forming dies are held for common sizes between 75 mm and 1500 mm diameter. Maximum proven practical diameter is 4.5 metres.

The four ply lock seam adds sufficient strength for the circular shape to be rigidly maintained up to 600 diameter in 1.0 mm material, or 500 diameter in lighter gauge. Additional rigidity and crushing strength can be achieved by the incorporation of one or two external swages. Common applications include ducting for heating, ventilating and air conditioning, smoke and exhaust stacks, chip conveyors, void forming in concrete, irrigation pipe and rubbish shutes on high rise buildings.

SPIROSET is a light weight air duct, machine formed in a continuous spiral from aluminium strip coil stock, corrugated and seamed with a four ply lock seam, creating an airtight tube which can be easily cut to length and bent by hand to conform to a desired duct route, with-out altering its full circular cross section. It is a characteristic of Spiroset that it will retain whatever configuration is required and is self supporting over its normal maximum length of 3 metres. Spiroset is available plain (without insulation), thermally insulated or acoustic (perforated) insulated.

SPIROFLEX is a super light weight flexible, compressible air duct consisting of two layers of 44 mm wide polyester tape, one metallised, helically wound to encapsuate a spring steel wire. It can be supplied plain or insulated. In it’s insulated form it is sheathed with a printed, opaque white, flame retarded, seamless outer sleeve. This duct has the ability to conform to any desired duct route, and its cross section may be deformed.

Spiroflex does not retain any configuration it is formed to, being of non-metallic construction, and has the advantage of compressibility for convenient packaging. A length of three metres of insulated duct can easily be compressed by hand to 300 mm, and when released after storage, immediately returns to its original length. Spiroflex is not self-supporting over its length and without adequate fixing ties, can move with changes in pressure. It should not be used on VAV diffuser connections where branch duct pressure may fluctuate, nor should it be used as high pressure (inlet) ducting to VAV boxes or other pressure reducing devices. Spiroflex complies AS4254: 2002 “Ductwork for air handling systems in buildings” and with the New Zealand Building Code requirements given in C3: Spread of Fire. The test results for Spiroflex, both plain and insulated, are: ignitability 0, spread of flame 0, heat evolved 0, and smoke developed 1. These tests were carried out in accordance with A.S. 1530.3 - 1989 “Simultaneous determination of ignitability, flame propagation, heat release and smoke release”.

Test Certificates

AS4254 Report of Testing – AWTA Textile Testing

Report No. 7-525654, 7-526643, 7-528665

Applied Physics Laboratory (TELARC) No’s 97180 & 97181