Brochure

OptionalPolytubeOutletAdapter-ApplytoModelB
Description
The optional outlet nozzle is designed to allow the attachment of polytube-type air distribu-
tion for use in greenhouse and industrial buildings. Outlet on suspended heater may be
either above, below, or directly in line with the heater discharge. A kit is available to oor
mount the heater with outlet below the heater discharge (see illustration). Model B stan-
dard blower and drive are designed to handle rated CFM at .25 w.c. ESP, and will inate a
24" tube up to 150 ft. long. See table for proper free area, minimum number of holes and
sizes. Units may be used for greenhouse heating and ventilating or in industrial applica-
tions requiring high mounting heights or spot heating by means of polytube distribution.
The total open or free area of the polytube is important. Polytube suppliers have a great
deal of exibility in placement and sizing of holes. Too small of a free area will cause over-
heating. Excessive open area may not permit the tube to inate. See the table below for a
guide in hole size and location. Spacing and hole size may be varied, but free area must
not be less than shown for the heater being installed.
Greenhouse Application - For greenhouse use, the number of units required is generally
based on an airow volume of 1-1/2 to 2 CFM per square foot of house oor area. Depend-
ing on the heat loss requirements of the house type, location, and desired temperature
above ambient, the ventilation requirements determine the number of distribution systems
required and the heat loss determines the BTUH heater size required. As a general rule, a
single system will serve a maximum house width of 30 ft. and a length of 150 ft.
Conversion Table
(Diameter to Area)
Diameter Area
of the of the
Hole Hole
(inches) (square inches)
2-1/2 4.91
2-1/4 3.98
2 3.14
1-7/8 2.76
1-1/2 1.76
1 0.785
Photograph shows polytube outlet. The
outlet nozzle requires eld assembly and
installation on the standard unit in place
of the top front panel and louvers. The
heater manufacturer does not supply tub-
ing. Tubing can be ordered from a local
greenhouse supply distributor. Two such
suppliers are FOF Products, Inc. P. O. Box
E, 1505 Racine Street, Delevan, WI 53115
and ACME Engineering Co., P.O. Box 978,
Muskogee, OK 74402.
CAUTION: To prevent overheating of the
blower unit heater and to ensure correct air
distribution, the minimum hole area must
be provided as shown in the table for each
size. If more holes are used, do not exceed
1.25 times the minimum area shown to en-
sure proper tube ination.
OptionsandAccessories(cont'd)
ApplytoUnitHeaterModelsasListed
Size
CFM at
.25”
ESP
Polytube
Diameter
(inches)
Minimum
Free Area
(sq.in.)
SuggestedHoleSizesandLocations
Holes
LengthofPolytube
50 Ft 75 Ft 100 Ft 125 Ft 150 Ft
75 925 18 110
Number 37pairs 75 pairs 75 pairs - - - -
Diameter 1-1/2” 1” 1” - - - -
Spacing 16” 12” 16” - - - -
100 1235 18 145
Number 50 pairs 50 pairs 100 pairs 94 pairs - -
Diameter 1-1/2” 1-1/2” 1” 1” - -
Spacing 12” 18” 12” 16” - -
125 1540 18 185
Number 40 pairs 60 pairs 60 pairs 125 pairs - -
Diameter 1-7/8” 1-1/2” 1-1/2” 1” - -
Spacing 15” 15” 20” 12” - -
130 1600 24 190
Number 40 pairs 60 pairs 60 pairs 125 pairs - -
Diameter 1-7/8” 1-1/2” 1-1/2” 1” - -
Spacing 15” 15” 20” 12” - -
165 2035 24 240
Number 50 pairs 50 pairs 75 pairs 75 pairs 75 pairs
Diameter 1-7/8” 1-7/8” 1-1/2” 1-1/2” 1-1/2”
Spacing 12” 18” 16” 20” 24”
200 2465 24 300
Number 42 pairs 42 pairs 60 pairs 60 pairs 100 pairs
Diameter 2-1/4” 2-1/4” 1-7/8” 1-7/8” 1-1/2”
Spacing 14” 21” 20” 25” 18”
250 3085 24 360
Number 40 pairs 60 pairs 60 pairs 60 pairs 60 pairs
Diameter 2-1/2” 2” 2” 2” 2”
Spacing 15” 15” 20” 25” 30”
300 3700 24 425
Number 75 pairs 75 pairs 75 pairs 75 pairs 75 pairs
Diameter 2” 2” 2” 2” 2”
Spacing 9” 12” 16” 20” 24”
400 4935 24 550
Number 60 pairs 60 pairs 60 pairs 100 pairs 100 pairs
Diameter 2-1/2” 2-1/2” 2-1/2” 1-7/8” 1-7/8”
Spacing 10” 15” 20” 15” 18”
Form RZ-C-UH (Version H) Page 40
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