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FINNED STRIP HEATERS
For Fast
Heat Transfer
OTF Series
U Rugged, Reliable,
Premium Quality
U 250 to 4150 W
1
⁄2" (3.8 cm) Strip [with
U 1
Fins 2" (5 cm) Wide]
U Maximum Work
Temperature from
225 to 565°F
U Available with Either
Rust-Resisting Iron or
Chrome Steel Sheath
FEATURES
Durability is assured by rugged
OMEGALUX® strip heater with
lock-on aluminized steel fins
Fast heat transfer to air from large
finned area.
Large selection of lengths, wattage
and watt densities.
UL Component Recognized
Finned elements (exclusive
construction). High-quality, coiled
nickel-chrome resistor wire is
uniformly spaced over the width and
length of the finned strip element,
then embedded in high-grade
refractory material which both
insulates the wire and transfers
heat rapidly. The refractory is then
compressed to rock hardness
and maximum density under
tremendous hydraulic pressure to
improve heat transfer from coil to
sheath. Elements are oven baked
at high temperatures to semi-vitrify
and mature the refractory. Sheath
material is either rust-resisting iron
or chrome steel. Fins of aluminized
steel are provided to improve that
transfer to the air. Elements are
individually replaceable.
APPLICATION
U For mounting across air stream
OTF-106/120 shown
smaller than actual size.
within forced air ducts
U For use in dryers, ovens and
other process air heating
equipment
U For comfort heating applications,
principally ducts, load banks and
U A wide range of air blast and
convection requirements can
be accommodated by the wide
range of lengths, wattages and
watt densities available
humidity controls
To Order
Rust-Resisting Iron Sheath for Sheath Temperatures to 750°F Maximum
Watts W/In2† A B F Model No. Ib (kg)
250 10 101⁄2 (27) 91⁄2 (24) 6 (15) OTF-102/* 2 (0.9)
350 15 10
600 25 10
500 17 12 (30) 11 (28) 7
750 25 12 (30) 11 (28) 7
250 8 12 (30) 11 (28) 7
900 25 14 (36) 13 (33) 9
500 15 14 (36) 13 (33) 9
325 8 15
1000 25 15
500 10 17
1000 19 17
1300 25 17
1000 18 19
1500 25 19
1000 16 21 (53) 20 (51) 16
1550 25 21 (53) 20 (51) 16
750 10 23
1000 14 23
1800 25 23
1250 16 25
2000 26 25
700 9 26
1350 17 26
2000 24 26
1500 17 30
2350 26 30
1000 9 35
1800 16 35
2850 26 35
2000 17 38
3100 26 38
3400 26 42
* Specify voltage, insert “120” for 120 Vac or 240 for “240” Vac. Model numbers containing
/120 or /240 are only available in that voltage.
†
To determine maximum allowable watt density.
Ordering Examples: OTF-127/120, finned strip heater 120 Vac.
OTF-102/240, finned strip heater 240 Vac.
Dimension: Inches (cm)
1
⁄2 (27) 91⁄2 (24) 6 (15) OTF-103/* 2 (0.9)
1
⁄2 (27) 91⁄2 (24) 6 (15) OTF-106/* 2 (0.9)
1
⁄4 (39) 141⁄4 (36) 103⁄4 (27) OTF-153/120 3 (1.4)
1
⁄4 (39) 141⁄4 (36) 103⁄4 (27) OTF-151/* 3 (1.4)
7
⁄8 (46) 167⁄8 (43) 133⁄4 (34) OTF-185/* 3 (1.4)
7
⁄8 (46) 167⁄8 (43) 133⁄4 (34) OTF-181/* 3 (1.4)
7
⁄8 (46) 167⁄8 (43) 133⁄4 (34) OTF-182/* 3 (1.4)
1
⁄2 (50) 181⁄2 (47) 15 (38) OTF-191/240 3 (1.4)
1
⁄2 (50) 181⁄2 (47) 15 (38) OTF-192/* 3 (1.4)
3
⁄4 (60) 223⁄4 (58) 191⁄4 (49) OTF-247/240 4 (1.8)
3
⁄4 (60) 223⁄4 (58) 191⁄4 (49) OTF-241/240 4 (1.8)
3
⁄4 (60) 223⁄4 (58) 191⁄4 (49) OTF-242/240 4 (1.8)
1
⁄2 (65) 241⁄2 (62) 21 (53) OTF-251/240 4 (1.8)
1
⁄2 (65) 241⁄2 (62) 21 (53) OTF-252/240 4 (1.8)
3
⁄4 (68) 253⁄4 (65) 221⁄4 (57) OTF-267/* 4 (1.8)
3
⁄4 (68) 253⁄4 (65) 221⁄4 (57) OTF-261/240 4 (1.8)
3
⁄4 (68) 253⁄4 (65) 221⁄4 (57) OTF-262/240 4 (1.8)
1
⁄2 (77) 293⁄8 (75) 25 (64) OTF-301/240 4 (1.8)
1
⁄2 (77) 293⁄8 (75) 25 (64) OTF-302/240 4 (1.8)
7
⁄8 (91) 347⁄8 (89) 303⁄8 (77) OTF-361/240 5 (2.3)
7
⁄8 (91) 347⁄8 (89) 303⁄8 (77) OTF-363/240 5 (2.3)
7
⁄8 (91) 347⁄8 (89) 303⁄8 (77) OTF-362/240 5 (2.3)
1
⁄2 (98) 377⁄8 (89) 33 (84) OTF-382/240 5 (2.3)
1
⁄2 (98) 377⁄8 (89) 33 (84) OTF-383/* 5 (2.3)
1
⁄2 (108) 417⁄8 (106) 37 (94) OTF-43/240 6 (2.7)
Weight
1
⁄2 (19) OTF-125/* 2 (0.9)
1
⁄2 (19) OTF-127/* 2 (0.9)
1
⁄2 (19) OTF-122/240 2 (0.9)
1
⁄2 (24) OTF-149/* 2 (0.9)
1
⁄2 (24) OTF-145/240 2 (0.9)
1
⁄2 (12) OTF-211/240 3 (1.4)
1
⁄2 (12) OTF-212/240 3 (1.4)
90
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