Watlow Heater Catalog
Air Heaters
Duct Heaters MDH SERIES
Velocity vs. Process Temperature
Modular Duct Heater – Velocity vs. Process Temperature
30 W/in 26 W/in 23 W/in
18 W/in
40 W/in
1000 1100 1200 1300 1400 1500 1600
8 W/in
100 200 300 400 500 600 700 800 900
Velocity – Feet/Min
0
700
900
1200
400
600
1100
0
200
300
100
800
1000
500
Process Temperature (°F) Based on 70°F Inlet Air Temperature
Watt Density vs. Sheath Temperature
Modular Duct Heater – Watt Density vs. Sheath Temperature
1550 FPM 1200 FPM 760 FPM 600 FPM
50
40
300 FPM
20 Watt Density-W/in 2 30
60 FPM Natural Convection
10
0
100
1300
700 900 Sheath Temperature ( ° F) 800 1000
1200
1400
400
600
1100
300
200
500
390
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