Retrotec DucTester 341 - Manual (Page 66)

Page 66 of 83
©Retrotec Inc. 2014
16. Create a Blower Door with a DucTester fan
16.1 Use a DucTester to test tight enclosures
To use your duct testing fan as a Blower Door system for testing tight enclosures you only need to add
an Aluminum Frame and a Low-Flow Cloth Door Panel. If you have a DucTester system, your Umbilical
will have blue, yellow and green tubes. In this case, the blue tube will be connected to the red port on
the gauge and passed through the panel. The graphic in Figure 42 shows the umbilical that comes with a
Blower Door system, with a red, yellow and green tube, and the red tube connected to the red gauge
port and going through the panel to the outdoors. It is not necessary to change your Umbilical just for
this color change.
Blower Door systems for testing tight enclosures should be set up as shown in Figure 42 below:
Figure 42: Blower Door setup using a Model 300 fan to test tight enclosures. The left image shows the Fan Top from a side
view of the Model 300 fan with tubing and Control Cable connections.
The green tube is always recommended and must be connected if the flow is towards the operator (i.e.,
air is blowing towards where the operator is standing). The Speed Control Cable can be plugged into
either one of the two Control ports.
To measure building envelope leakage with Blower Door testing, please refer to procedures outlined in
Retrotec’s Manual-Door Fan Operation and QuickGuide-Blower Door.
16.2 Blower Door systems for testing tight enclosures