Retrotec Commercial 441 and 451 DucTester - Manual (Page 10)

Page 10 of 56
©Retrotec Inc. 2015
3. Model 451 DucTesters
Models include 451 with 10-2.5 (250-63 mm) Adapter for 4 inch (100mm) 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 Model 451 duct testing system showing 3 optional Flow Plugs and one blanking plug.
3.1 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