Retrotec DucTester 341 - Manual (Page 17)

Page 17 of 83
©Retrotec Inc. 2014
5. Model 341 DucTesters
Models include US341 and EU341 with 10 inch Flex Duct
A complete DucTester includes a calibrated fan, a digital dual-channel Model DM32 digital touch screen
pressure gauge, and a Flex Duct with flange to attach the fan to a register. Systems also include a hard-
sided fan case, an AC adaptor for the gauge, and a roll of Grill Mask. All pressure tubing and Control
Cables are bundled together securely in one easy to use Umbilical cable (included), and the included
tubing accessory kit contains T connectors and tube lengths for other non-typical tasks.
Figure 2: A complete duct testing system.
5.1 The calibrated DucTester fan
Retrotec’s DucTester was specifically designed for testing ducts and tight enclosures. It has more than
three times the power necessary to test the leakiest duct system to current standards. The backward
curved centrifugal impeller is perfect for creating high test pressures. The elliptical nozzle is extremely
stable in both the pressurization and depressurization test directions, where it offers equivalent
accuracy in both directions.
A Flow Conditioner is not needed with Retrotec fans for depressurization testing. Some duct testing
fans require a flow conditioner when depressurizing a duct system, in order to get correct readings. The
Retrotec DucTester does not require a flow conditioner because it uses a flow nozzle, which is
intrinsically stable in either direction because the flow gets compressed as it goes through the nozzle.
All Retrotec models comply with ASTM E1554-07, ANSI/ASHRAE 152, ASTM E779-10, EN 13829, ATTMA
TS-1, CGSB 149.10 and RESNET standards.
The DucTester Fan can be used as part of a Blower Door system for testing tight enclosures, as shown in
section 16. For procedures on how to test an enclosure using a Blower Door system, see Residential
Pressure & Air Leakage Testing Manual and/or the Blower Door Operation Manual from the Retrotec
web site. You can also search on blower door as a tag to find these manual, guides and videos on the
website also.