FireNET Vapor VPR-SD1 Product Guide
Hochiki America Corporation
3.3
Sampling Holes
Sampling holes can either be pre-drilled or drilled in situ. Use a low speed drill with a sharp drill bit to prevent debris
from entering the pipe. Always blow compressed air through the pipe after drilling to clear any debris before final
connection to the equipment.
Sampling Holes for Open Area Applications
l
The installer can drill the necessary holes in sampling probes and exhaust pipes either prior to or during
installation, as per the sampling pipe network design.
l
In standard configuration, with pipe hanging from ceiling, holes should be placed underneath, so the smoke can
easily rise up into the hole.
l
It is important that the correct diameter sampling holes be drilled, as this affects system performance and
efficiency.
l
Sampling holes must be drilled at 90 degree angles to the pipe.
l
Attach adhesive labels to identify the sampling points.
Sampling Holes for Duct Applications
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The installer can drill the necessary holes in sampling probes and exhaust pipes either prior to or during
installation, as per the sampling pipe network design.
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Sampling holes must be oriented facing away from the airflow.
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Sampling probes and exhaust tubes must be matched with the same number of holes, each with the same
diameter.
3.4
End Cap
A
B
Legend
A
End Cap
B
Sampling Hole
Figure 3-1: End cap with hole drilled in center
End Cap for Open Area Applications
l
The end of the pipe must be capped with an end cap and not be left open.
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The end cap typically has a sampling hole drilled in its center to control airflow. For pipes with only a few
sampling holes, it is recommended that the end cap hole be same size as the sampling holes along the pipe. The
hole in the endcap is included in the total number of holes.
Refer to Section 3.9 on page 17 for approved configurations.
End Cap for Duct Applications
l
End caps without sample holes are required for both sample and exhaust tubes.
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