John Rowland at Dallas Mining Services has had considerable experience designing small auxiliary ventilation systems for underground and surface mining, industrial and environmental applications.
He has designed numerous ducting and fan installations for projects including extended single entry driveages, surface to underground long run systems, blowing auxiliary systems and the like.
Installations have been diverse and pictured is a series installation utilising 2 x 23m3/sec auxiliary fans and an evasee to drive extended distances in the absence of a primary ventilation system.
Dallas Mining has also developed a leaky duct Excel spreadsheet which involves the use of a diverse database of fan curves which can be linked to a circuit resistance under assessment and Ventsim is also utilised as a suitable modelling tool for many applications.
Considerable testing and application under real conditions has shown repeated acceptable practical results when compared to modelled values.
Most of this work can be done remotely from the site and relatively inexpensively over extremely short time frames to satisfy the client.
BELOW: An auxiliary system with a fan curve from Ventsim Visual