Retrotec Commercial 441 and 451 DucTester - Manual (Page 8)

Page 8 of 56
©Retrotec Inc. 2015
1. Model 300 / 400 System Types:
The Model 400 indicated the fan body. Model 451 is used to show it comes with a DM32 gauge, Model
452 means DM32 WiFi gauge. Model 551 shows the system has a 10 to 2.5 inch (250 to 63 mm) Adapter
that goes over the fan inlet to allow for pressurization.
The Model 400 Blower shares its housing, inlet nozzles and Flow Plates with several other models as
shown below. Each one is specialized for a certain application. The Model 341 is used primarily in the US
for relatively leaky US made ducts. The Model 351 is for tighter European ducts that often have to be
100 times tighter than US ducts. The Model 301 is simply the same fan but attached to a door panel for
testing tight houses, apartment, rooms or enclosures. The Model 451 is meant exclusively for testing
commercial ducts at 10 to 100 times the test pressure used for US residential duct that are tested at 25
Pa normally and sometimes 50 Pa. the Model 451 has 10 times the power and is much heavier than the
351 but still a fraction of the old fashioned Commercial duct testers in common use.
This manual focuses on the Model 400 Blower an attachments that make up 441 and 451 Systems. Be
sure to refer to the Quick Guide that came with your system or can be obtained at:
http://retrotec.com/support/manuals-guides
341 351 301 451
The US DucTester system
is powerful enough to test
leaky ducts that are found
in both new and existing
homes. New ranges will
go down to tight ducts
also. ‘European DucTester’
tailored for European
ducts. Comes with all the
Ranges needed for the
tightest ducts but just
add the aluminum frame
to test houses. The Model 300 is ideal
for testing tight houses
as large as a 1600
square feet of floor area
that leak as much as 3
Airchanges per Hour. Commercial duct
testing up to 20 in WC
(5000 Pa) in a
compact package.