Technical questionnaire

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Attention: Frequently all operating details are either not known or only inaccurately known. You must therefore as a manufacturer make sure by suitable tests that the correct fan wheel has been selected. When the following questions are answered as comprehensive as possible, we can submit a proposal as quickly and as defi nite as possible. Please give us further details on a supplementary sheet. This questionnaire on no account replaces a technical specifi cation (TSP).

1. General Information

1.1. Fan application (type of unit and appliance, rail application, compressor, etc.)

1.2. Are there any special requirements on safety conditions? (e.g. explosion protection, danger of accident at wheel failure, etc.)


Please state special requirements:

1.3. Medium to be handled and its state (e.g. smoke gas with t max = 300° C, dust laden air or similar)??

2. Air Duty

2.1. Volume flow
V' = m³/hcfm

2.2. Static pressure increase
Δpfa = PainWG

2.3. single flow/double flow? &nbsp &nbsp &nbsp einflutigdoppelflutig

2.4. Density of the medium
rho = kg/m³lb/ft³

2.5. Max. media temperature
t = °C°F

2.6. Max. A-rated sound power level
Lw = dB(A)

2.7. Other technical details (e.g. max. flow speed, special curve steepness, etc.)?

3. Drive

3.1 Is the speed variable?


minimum ; maximum rpm
fixed speed rpm

3.2. Direct motor drive

n = rpm

3.3. Is a maximum motor power specified?


maximum motor power Pw = kWhp

3.4 Operating mode?

S1 - IEC 60034-1other operating mode

other operating mode =

4. Dimensions and Constructional Execution of the Fan Wheel

4.1. Can a standard fan housing be used?


max. dimensions of spiral housing:

4.2. Are certain main wheel dimensions defined?

main wheel dimensions:

4.3. Hub bore
Ø d = mm, fit
with/without keyway?


4.4. Hub model and arrangement (e.g. inside the wheel, outside, etc.)

4.5. Material of wheel body


other material:

4.6. Additional surface protection


other surface protection:

4.7. Additional specifications

5. Demand, Pricing

5.1 You would like to request an offer for:

Sample wheels: pcs.

(later) batch: pcs/year

Lot size pcs/order

5.2 planned start of production TT/MM/JJJJ