Hot air system Air flow resistance calculation
To ensure correct application with the correct air distribution system, it is important to have a continuous main line with openings that cannot be closed. The sum of the resistance points of the main line must not exceed the maximum number of resistance points for each air heater model. Lines branching off from the main line are not taken into account. Consequently, the branches can also be designed with closable outlets. In the following table, several air ducting parts are listed. Exceeding the number of points (excessive air resistance of the heating air system) is detected by the heater after starting. For safety reasons, continuous heating operation is then no longer possible and the heater switches to control pause.
Air Top 2000 STC: max. 325 resistance points
Air Top Evo 40: max. 550 resistance points Air Top Evo 55: max. 375 resistance points
55 / 60 mm inlet
80 / 90 mm inlet
Dim. in mm
Points
Dim. in mm
Points
Part number
Part number
Intake grill / grille
60
24
1320163
90
65
1310581
Flexible tubing per meter
55
30
various
80
27
various
60
27
various
90
25
various
Additional points for elbow in flexible tube
55
10
various
80
7
various
60
8
various
90
6
various
Air ducting silencer
–
–
–
90
24
1321734
–
–
–
90
16
1320996
Reducing adapter air intake
90 > 80
45
1320186
Reducing adapter
60 > 55
27
1320127
80 > 55
223
1319477
–
–
–
90 > 60
211
1320760
–
–
–
90 > 80
45
1320185
–
–
–
90 > 80
45
1320925
Hose connector
55
12
1319473
80
5
1319476
60
10
1320469
90
5
1319869
51
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