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Why
an Airtight Duct?
Duct integrity is essential for a successful cable blowing application.
Leaks in the duct can lower pressure and greatly reduce installation
distances. The duct system must be able to withstand and maintain
150 psi (10.3 bar) minimal leakage, the compressor will not be able
to maintain pressure behind the cable carrier. This ultimately can
reduce the pulling force of the cable carrier and can increase tractor
drive pressure on the cable, resulting in increased cable stress.
Duct integrity
should always be tested before attempting cable installation with
the cable blower. The duct can be tested with a pressure test kit
available from Condux or with the cable blower itself. Either way,
an airtight duct system is an absolute necessity for cable blowing.
The main contributors
to duct system leaks are the innerduct couplings. Condux recommends
using one of the innerduct couplings that are posted with the Cable
Blowing section in this website.
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