TECHNICAL INFORMATION

COLLAPSIBILITY STRENGTH OF SPEEDY DUCTING DUCTWORK

Each size of piping has been tested for strength against collapsing. The piping was exposed to constant positive pressure and constant vaccum.  Each duct was exposed to a maximum capacity of the test equipment of 40" WG of vacuum and positive pressure. None of the pipe showed any form of deformation during the test. Duct & fittings must be installed in accordance with ASM's standard specifications and normal good workmanship practices.

LEAKAGE IN SPEEDY DUCTING SYSTEM

All fit together ducting systems allow for some degree of leakage. "Q.A" ducting is no exception and is not sold as an airtight ducting system. In addition to standard PVC foam gasket, Speedy Ducting offers special clamp gasket material for high heat and enhancing sealing. Further, the applying of sealants to the individual rolled ends can enhance the tightness of the system. However, the " Q.A" system is sold as a quick way of installing and modifying duct-work while at the same time retaining the usability of each component. In short, "Q.A" is meant to be able to taken apart, re-assembled, stored or moved. Completely eliminating the possibility for leakage jeopardises the inherent benefits of the Speedy Ducting system. Standard "Q.A" is designed to provide tight sealing and efficient air flow under negative pressures. To that end we are providing the following information for piping situations where fan sizing is extreme importance.

The following data was obtained using standard components from the Speedy Ducting system and was performed in accordance with the "HVAC AIR DUCT LEAKING TEST MANUAL". The information gives the leakage rate per joint of duct at various pressures. To utilise the chart, count the number of clamps (This equals the number of pieces) per rise and multiply by the number given beside the corresponding diameter and under the applicable pressure. These numbers assume that the product is product is properly installed; free of dents in the joining ends and the gasket is in place. Special gasket material and sealants will increase the sealing capabilities of the Speedy Ducting system.

LEAKAGE RATE FOR SPEEDY DUCTING SYSTEM IN CFM PER Q.A. JOINT

SEALANT USED ON SEAMS OF COMPONENTS

Scotch Seal 2084 metal sealant, 3m ID # 62-2084-2631-2.

Ingredients: acetone, acrylonitrile, kaolin, phenolic resin, rosin ester salicylic acid, aluminium pigment zinc oxide, amorphous silica

SPEEDY DUCTING SYSTEM DUCT SPECIFICATIONS

COMPONENT MATERIAL

1.Components constructed of galvanised steel sheets produced by the continuous galvanising process, which conforms to lock forming quality ASTM A-527, and commercial quality ASTM A-526.

Galvanised sheeting is produced with the minimum of spangle.

2.Components constructed of stainless steel will be 304 2B mill finish as standard, or 316 2B mill finish if specified.

ROLLED EDGE DUCTING - Material sheet blanks are 2000mm long and rolled with a longitudinal seam. The ends of the duct are then formed at each end, thus producing a rolled edge on both ends of the duct, and creating reinforcement every 2000mm.

FLANGED DUCTING - Material sheet blanks are 2000mm long and rolled with a longitudinal seam. A flat bar flange is placed on the end of each duct, and is allowed to spin, thus making it easier to line up holes when installing. All rolled duct joints are secured by using a clip. Locking pins are installed to ensure that clips can not be accidentally released once installed.

 

Dia	Sheet Thickness
100mm	0.7mm
125mm	0.7mm
140mm	0.7mm
160mm	0.7mm
180mm	0.7mm
200mm	0.7mm
250mm	0.7mm
315mm	0.9mm
350mm	0.9mm
400mm	0.9mm
450mm	0.9mm
500mm	0.9mm

VELOCITY REQUIREMENTS FOR TYPICAL MATERIALS

RULE OF THUMB LABOUR GUIDELINE