Options and Accessories

OptionalPolytubeOutletAdapter-ApplytoModels
UDBP/UDBS
Description
The optional polytube adapter is designed to adapt suspended Model UDBP
and UDBS blower type unit heaters for use with polytube ductwork. Directly
in line with the heater discharge, the adapter is installed on the front of the
heater and is equipped with a collar for attaching the eld-supplied polytube.
The most common application of polytube ductwork for distribution of tem-
pered air is in greenhouses. Polytubes are also used in industrial buildings
to improve operating efciency by recovering stratied air and reducing the
need for complete area heating.



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* Required direct drive blower speed.
Size Speed
75 Low
100 Low
125 Medium
Size
CFM
at 60°F
Temp Rise
Polytube
Diameter
(inches)
Approximate
Free Area
(squareinches)
SuggestedHoleSizesandLocations
Holes
LengthofPolytube
50 Ft 75 Ft 100 Ft 125 Ft 150 Ft
75* 960 18 115
Quantity 75 75 75 75 75
Diameter (inches) 1 1 1 1 1
Spacing (inches) 8 12 16 20 24
100* 1345 18 160
Quantity 48 48 48 48 48
Diameter (inches) 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2
Spacing (inches) 12 1/2 18 3/4 25 31 1/4 37 1/2
125* 1540 18 185
Quantity 50 50 50 50 50
Diameter (inches) 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2
Spacing (inches) 12 18 24 30 36
150 1920 24 230
Quantity 40 40 40 40 45
Diameter (inches) 2 2 2 2 1 7/8
Spacing (inches) 15 22 1/2 30 37 1/2 40
175 2240 24 270
Quantity 50 50 80 80 80
Diameter (inches) 1 7/8 1 7/8 1 1/2 1 1/2 1 1/2
Spacing (inches) 12 18 15 18 3/4 22 1/2
200 2560 24 300
Quantity 50 50 50 50 50
Diameter (inches) 2 2 2 2 2
Spacing (inches) 12 18 24 30 36
225 2880 24 340
Quantity 42 42 42 42 42
Diameter (inches) 2 1/4 2 1/4 2 1/4 2 1/4 2 1/4
Spacing (inches) 14 21 28 35 42
250 3200 24 380
Quantity 50 50 50 60 60
Diameter (inches) 2 1/4 2 1/4 2 1/4 2 2
Spacing (inches) 12 18 24 25 30
300 3840 24 460
Quantity 60 60 75 75 75
Diameter (inches) 2 1/4 2 1/4 2 2 2
Spacing (inches) 10 15 16 20 24
350 4480 24 540
Quantity 50 50 50 50 50
Diameter (inches) 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2
Spacing (inches) 12 18 24 30 36
400 5120 24 600
Quantity 60 60 75 75 75
Diameter (inches) 2 1/2 2 1/2 2 1/4 2 1/4 2 1/4
Spacing (inches) 10 15 16 20 24
OptionsandAccessories
ApplytoUnitHeaterModelsasListed
StepdownTransformers-(ModelsFandB)
Unit Size
Model 25 50 75 100 125-200 250 300 400
F (heater only) .25 .25 .25 .50 .50 .50 .50 1.00
F with Field-installed Optional Venter .25 .50 .50 .50 .75 .50 .75 1.00
B (heater only) .50 .50 1.0 1.0
B with Field-installed Optional Venter .50 .50 1.0 1.0
Form RZ-C-UH (Version H) Page 39
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