Retrotec Commercial 441 and 451 DucTester - Manual (Page 15)

Page 15 of 56
©Retrotec Inc. 2015
Figure 8: DM-32 digital gauge.
Model 351 use the DM32 gauge while Model 352 signifies the WiFi enabled gauge that works exactly the
same in every other respect.
The latest Retrotec Digital Gauge is included with all Retrotec DucTester systems. The gauge can be
combined with the Model 300 fan for automatic control to Set Pressure or Set Speed. The gauge is a
dual-channel manometer, which can automatically convert the measured Fan Pressure into a range of
useful results that meet every major testing standard in the world.
The gauge is also capable of taking a Baseline pressure reading, and automatically recalculating results,
in order to reflect this bias pressure. It can auto zero itself to ensure pressure readings do not drift away
from the true pressure value during a test. It is also capable of displaying results that are extrapolated
to any pressure.
For more information on configuring and using the DM-32, see the DM-32 Operation Manual.
3.3 Flex Duct
Retrotec's duct testing systems US351 and EU351 include a 4" diameter, 12' long flexible duct to
connect the test fan to a register, or duct system. The 250 mm Adapter friction fits over the inlet OR
outlet of the fan to provide a quick means to test in both the depressurize and pressurize directions.
Figure 9: Flex Duct for duct testing system with 10 to 2.5 inch (250 to 63 mm) Adapter.
3.4 Additional included duct testing components
In addition to the calibrated fan and digital dual-channel pressure gauge, a Retrotec DucTester system
includes a few additional items.
3.4.1. Grill Mask for sealing registers
Grill Mask is used to seal over registers and vents. Grill Mask comes in a 12" wide roll.
It is perforated at 12" intervals to provide easy-to-tear pieces that can seal nearly
anything. Be careful applying Grill Mask to painted surfaces, as paint can be pulled off
when removing it after testing. Grill Mask can be ordered from Retrotec as a single roll
or in three roll bundles. A handy Grill Mask dispenser is also available as an optional
accessory.