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OTF

Finstrip® Air Heater

Rust-Resisting Iron or Chrome Steel Sheath
250 - 4,150 Watts
120 and 240 Volt
Single Phase
225 - 565°F Max. Work Temp.
1-1/2" Strip with Fins 2" Wide
Third-party certifications: UL Recognized, CSA, DVE

Mount across Air Stream within Forced Air Ducts
Use in Dryers, Ovens and other Process Air Heating Equipment
Comfort Heating in Ducts, Load Banks and Humidity Controls
Many Air Blast and Convection requirements can be accommodated by the wide range of lengths, wattages and watt densities available.

Selection Guidelines

Maximum Work Temperatures — Finstrip® elements can generally be used in the applications above, at maximum temperatures, without exceeding their capability, if properly installed according to instructions packed with heater.

Air Velocity (ft/sec.)	Max. Outlet Air Temp. (°F)
Air Velocity (ft/sec.)	Iron Sheath	Chrome Steel Sheath
Free Air	225	315
16	460	565

Note - Maximum temperatures are based on 15 W/In² density for iron sheath and 20 W/In² density for chrome steel sheath. If elements have a lower watt density, work temperature may be increased; if watt density is higher, work temperature should be lower.

See Allowable Watt Density & Finstrip® Heater Selection Graphs G-107S and G-108S in the Technical section of this catalog.

Durability is assured by rugged Chromalox strip heater with locked-on aluminized steel fins.

Rapid Heat Transfer to air from large finned area.

Large Selection of lengths, wattages and watt densities.

Options

Secondary Insulation Bushings are needed at each end of Finstrip® elements when connected in series on line voltages 300V and above. To accommodate bushings, a 17/32 x 11/16" mounting hole in tabs should be specified for elements. A secondary bushing set (PCN 255716) should be specified. Each set includes two bushings and hardware for one heater.

Removable Terminal Covers (OT-AC-1) — Shipped unassembled (PCN 129242).

Ceramic Post Terminal Insulators — Nickel plated steel hardware (PCN 259805). Stainless Steel hardware (PCN 255732).

Extra Long Finstrips — Available in 48, 54, 64 or 72" length.

MONEL® Sheath and Fins — Contact your Local Chromalox Sales office for price and availability.

Select Parameters

Clear Parameters

Select a Part

Part #	Description
128004	OTF-10 120V 250W	Buy Now
128012	OTF-10 120V 350W	Buy Now
128020	OTF-10 120V 600W	Buy Now
128039	OTF-10 240V 250W	Buy Now
128047	OTF-10 240V 350W	Buy Now
128055	OTF-10 240V 600W	Buy Now
128063	OTF-12 120V 500W	Buy Now
128071	OTF-12 120V 750W	Buy Now
128080	OTF-12 240V 250W	Buy Now
128098	OTF-12 240V 500W	Buy Now
128100	OTF-12 240V 750W	Buy Now
128119	OTF-14 120V 900W	Buy Now
128127	OTF-14 240V 500W	Buy Now
128135	OTF-14 240V 900W	Buy Now
128143	OTF-15 120V 325W	Buy Now
128151	OTF-15 120V 1000W	Buy Now
128160	OTF-15 240V 1000W	Buy Now
128178	OTF-18 120V 500W	Buy Now
128186	OTF-18 120V 1000W	Buy Now
128194	OTF-18 120V 1300W	Buy Now
128207	OTF-18 240V 500W	Buy Now
128215	OTF-18 240V 1000W	Buy Now
128223	OTF-18 240V 1300W	Buy Now
128231	OTF-19 120V 1500W	Buy Now
128240	OTF-19 240V 1000W	Buy Now
128258	OTF-19 240V 1500W	Buy Now
128266	OTF-21 240V 1000W	Buy Now
128274	OTF-21 240V 1550W	Buy Now
128282	OTF-24 240V 750W	Buy Now
128290	OTF-24 240V 1000W	Buy Now
128303	OTF-24 240V 1800W	Buy Now
128311	OTF-100 120V 475W	Buy Now
128320	OTF-100 120V 725W	Buy Now
128338	OTF-100 240V 350W	Buy Now
128346	OTF-100 240V 475W	Buy Now
128354	OTF-100 240V 725W	Buy Now
128362	OTF-120 120V 700W	Buy Now
128370	OTF-120 120V 900W	Buy Now
128389	OTF-120 240V 700W	Buy Now
128397	OTF-120 240V 900W	Buy Now
128400	OTF-140 120V 750W	Buy Now
128418	OTF-140 120V 1100W	Buy Now
128426	OTF-140 240V 750W	Buy Now
128433	OTF-140 240V 1100W	Buy Now
128442	OTF-150 240V 850W	Buy Now
128450	OTF-150 240V 1250W	Buy Now
128469	OTF-180 240V 750W	Buy Now
128477	OTF-180 240V 1000W	Buy Now
128485	OTF-180 240V 1550W	Buy Now
128493	OTF-190 208V 1000W	Buy Now
128506	OTF-190 240V 1000W	Buy Now
128514	OTF-190 240V 1250W	Buy Now
128522	OTF-190 240V 1700W	Buy Now
128530	OTF-210 240V 750W	Buy Now
128549	OTF-210 240V 1250W	Buy Now
128557	OTF-210 240V 1900W	Buy Now
128565	OTF-240 240V 1000W	Buy Now
128573	OTF-240 240V 1450W	Buy Now
128581	OTF-240 240V 2200W	Buy Now
128602	OTF-25 240V 1250W	Buy Now
128610	OTF-25 240V 2000W	Buy Now
128629	OTF-26 120V 700W	Buy Now
128637	OTF-26 240V 700W	Buy Now
128645	OTF-26 240V 1350W	Buy Now
128653	OTF-26 240V 2000W	Buy Now
128670	OTF-30 240V 2350W	Buy Now
128688	OTF-36 240V 1000W	Buy Now
128696	OTF-36 240V 1800W	Buy Now
128709	OTF-36 240V 2850W	Buy Now
128717	OTF-38 120V 3100W	Buy Now
128725	OTF-38 240V 3100W	Buy Now
128733	OTF-43 240V 3450W	Buy Now
128750	OTF-250 240V 1500W	Buy Now
128768	OTF-250 240V 2400W	Buy Now
128776	OTF-260 240V 1600W	Buy Now
128784	OTF-260 240V 2500W	Buy Now
128792	OTF-300 240V 1800W	Buy Now
128805	OTF-300 240V 2800W HKL	Buy Now
128813	OTF-330 120V 3150W	Buy Now
128821	OTF-330 240V 3150W	Buy Now
128830	OTF-360 240V 1500W	Buy Now
128848	OTF-360 240V 2300W	Buy Now
128856	OTF-360 240V 3450W	Buy Now
128864	OTF-380 240V 2450W	Buy Now
128872	OTF-380 240V 3600W	Buy Now
128880	OTF-430 240V 4150W	Buy Now
128944	OTF-330 240V 2100W	Buy Now
128952	OTF-30 240V 1500W	Buy Now
128960	OTF-38 240V 2000W	Buy Now
128979	OTF-480 240V 2250W	Buy Now

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