1 
 Requirements on Minimum Energy Performance Standard, Labelling and 
Inspection of Fans (Draft)  
1. The fans referred to in this Announcement  are those driven by a three -phase AC motor (“Fans ” or 
“products ” hereafter), including axial fan, centrifugal forward curved fan , centrifugal radial bladed 
fan, centrifugal backward curved fan(with housing), centrifugal backward curved fan(without 
housing ) and mixed flow fan, which shall be in compliance with the applicable scope set out  in 
the Appendix 1. 
2. Fans shall be tested for the energy efficiency measured value pursuant to the  currently effective 
National Standards of the Republic of China (“ CNS ”) 7778 or other approved equivalent m eans 
International Organization for Standardization (“ISO”) 5801, or Air Movement and Control 
Association ( “AMCA” ) 210. 
The measured energy efficiency values of the F ans in the preceding paragraph shall not be lower 
than the minimum energy performance standard requirements for Fans (see Appendix 2) and shall 
be higher than or e qual to the rated value of product. The three- phase AC motor s driving the fans 
which are designated by the Central Competent Authority's announcement shall comply with the 
minimum energy performance standards for the motor s. 
3. While manufacturing or importing the Fans for domestic use, the product manufacturer or impor ter 
(hereafter referred to as “ Dealer ”) shall submit the following documentation to the Central 
Competent Authority to apply for the registration account and password for Minimum Energy Performance Standard Management System (hereafter referred to as “ Management System ”), in 
order to ac cess the Management System:  
(1) Original copy of the Application Form for Management System Registration Account and Password (Appendix 3). 
(2) Copy of the D ealer ’s corporate registration certificate or commercial registration certificate, 
or other equivalent certificates.  
4. After obtaining the Management System account and password, the D ealer shall apply for 
registration of the energy efficiency via the Management System, and submit the following documentation to the Central Competent Authority:  
(1) Original Copy o f the Application Form for Registration of Fans Energy Efficiency (see 
Appendix 4). 
(2) Registration of main model s: For application for more than nine main models  of each 
category of Fans , the Dealer shall provide copies  of the test report s on energy efficiency of 
eight  main model s designated by the Central Competent Authority with official corporate 
seal of the Dealer . While applying for the registration of no more than eight main models, 
copies of the test report s on energy efficiency of all the main  models in application shall be 
submitted with official corporate seal of the  Dealer .  
2 
 For the registration of main models , Fans with either different impeller diameter, the 
transmission connection method and inlet  conditions (single suction/double suction) shall be 
deemed  Fans of different main models.  
The energy efficiency test report mentioned in Section 4. (2) shall be issued by laboratories 
approved by the certified authorities that are members to the mutual recognition agreement signed by t he Taiwan Accreditation Foundation (“TAF”) and the International Laboratory 
Accreditation Cooperation (“ ILAC ”), or be issued by Underwriters Laboratories Inc. 
(“UL”) or Technischer Überwachungs -Verein (“ TÜV”).  
5. The Central Competent Authority shall approve the registration number of the product in 
accordance with the energy efficiency test report and energy efficiency rated value registered by 
the Dealers. The Central Competent Authority may conduct product sampling and testing before 
approving, and the D ealer shall bear the related costs.  
6. When manufacturing or importing the Fans for domestic use, the Dealer shall re- apply for the 
registration for the energy efficiency in the following instances:  
(1) The design of the product has been changed and such change a ffects its energy efficiency.  
(2) The product model number has been changed.  
7. While manufacturing or importing the products for domestic use, the Dealer  shall post the 
following items on strong nameplates on a prominent area of the products  the Dealer . These items 
shall all be labeled in Traditional Chinese, provided that the unit symbols, special characters, trademark and symbol cannot be indicated in Traditional Chinese. The D ealer shall not conceal, 
destroy or in any other way make the following inf ormation unrecognizable:  
(1) Name of the product: axial fan , centrifugal forward curved fan , centrifugal radial bladed fan , 
centrifugal backward curved fan(with housing) , centrifugal backward curved fan(without 
housing) and mixed flow fan;   
(2) Product ’s model num ber: different main model s shall have different main model  number ; the 
model number shall  be main model number - secondary number ; 
(3) Rated power (kW) , rated voltage (V), pole  and frequency of motor: it refer s to the 
information of motor ; if this information has been labeled on the nameplate of motor in f an, 
it can be omitted; 
(4) Measurement category (A/B/C/D): used to determine the energy efficiency , pursuant to the 
active CNS 7778;  
(5) Impeller diameter (millimeter, mm) ; 
(6) V olume f low rate (m
3/min) : at the best efficiency point ; 
(7) Static pressure or total pressure (mmAq): at the best efficiency point ; 
(8) Rotations per minute (rpm): at the best efficiency point ;  
3 
 (9) Input power (kW): at the best efficiency point ; 
(10) Efficiency (%): at the best efficiency poi nt; 
(11) Efficiency grade:  The actual measured  efficiency grade and the efficiency grade 
corresponding to the minimum energy performance standard (N v alue) shall be marked, such 
as FMEG 68/64.  
(12) Product ’s registration number; 
(13) Number and year of manufacture;  
(14) Production country or region;  
(15) Name of the manufacturer or OEM consigner: for imported products, the name of the 
manufacturer or OEM consigner, agent, or distributor shall be labeled.  
Fans with or without three -phase AC  motors  shall be labeled in conformity  with the 
requirements  as set forth in the preceding paragraph while being exhibited or sold. 
8. While manufacturing or importing the products for domestic use, the Deal er shall report the sales 
volume of the previous year in the management system before the end of February each year.  
9. The Central Competent Authority may designate the model and volume of Fans annually for product sampling and testing. The Deal er shall send such product to the designated testing 
laboratory for testing within the period informed by the Central Competent Authority , or the 
Central Competent Authority may designate personnel or professional institutions  to witness the 
testing procedures and methods. The measured energy efficiency value of the product should be 
above  95% of the rated value of the product, and comply with the minimum energy performance 
standard requirements . 
For products fail to meet the requirements in the preceding paragraph, the Central Competent 
Authority shall  request the related Deal er to re -submit samples for re -testing. The re -tested 
samples shall be of the same model and twice as many as the first -tested samples. All the incurred 
cost associated with the re- testing shall be borne by the Dealer . 
10. The volume of the first sampling and testing products  in Section 9 shall be determined based on 
the total amounts of the products sold by each Dealer in the preceding year:  
(1) One sample shall be tested out of 100 units of axial fans , a maximum of 5 units for each D ealer , 
while there are less than 100 unit s sold, one sample shall still be tested.  
(2) One sample shall be tested out of 300 units of centrifugal forward curved fans , a maximum of 
5 units for each D ealer, while there are less than 300 units sold; one sample shall still be tested.  
(3) One sample s hall be tested out of 50 units of centrifugal radial bladed fans , a maximum of 5 
units for each Dealer , while there are less than 50 units sold, one sample shall still be tested.  
(4) One sample shall be tested out of 200 units of centrifugal backward curved fan s (with housing), 
a maximum of 5 units for each D ealer , while there are less than 200 units sold, one sample shall  
4 
 still be tested.  
(5) One sample shall be tested out of 50 units of centrifugal backward curved fans  (without 
housing), a maximum of 5 units for each D ealer , while there are less than 50 units sold, one 
sample shall still be tested.  
(6) One sample shall be tested out of 50 units of mixed flow fans , a maximum of 5 units for each 
Dealer , while there are less than 50 units sold, one sam ple shall still be tested.  
The Central Competent Authority may adjust the sampling volume prescribed in the preceding 
paragraph based on actual needs . 
11. Where a Dealer  fails to conduct the product testing or re -testing in compliance with the proceeding 
parag raph, or where the re- tested samples fail to  completely comply with the requirements, the 
Central Competent Authority shall act in accordance with Articles 21 and 24 of the Energy Management Act. For those fail to complete the corrective actions within the  designated period, 
the Central Competent Authority shall annul  its energy efficiency registration, except where the 
Dealer fails to conduct the energy efficiency test due to the fact that the designated sampling and 
testing products are no longer produced or imported, and the Central Competent Authority has 
agreed  and canceled its energy efficiency registration.  
The Central Competent Authority shall disclose the information under the preceding paragraph on the Management System pursuant to the Consumer Pr otection Act and the relevant regulations. 
 
   
5 
 Appendix 1  
Applicable Scope of Fans  
1. Applicable Scope:  
This standard applies to fans , which h ave impeller diameter range from 0.125m to 2m, rated power 
of 0.75 (1HP) to 200kW (270HP), static pressure  is 15 to 1000 mmAq, volume flow rate  is 10 to 
3000 m3/min., and driven by a three -phase AC motor, including:   
(1) Axial fan:  
A fan that propels gas in the direction axial to the rotational axis of impeller(s). It may or may not 
be equipped with a cylindri cal housing, an orifice panel or orifice ring , or an inlet or outlet guide 
vanes.  
(2) Centrifugal forward curved fan:  
A fan in which the gas enters the impeller(s) in an essentially axial direction and leaves it in a 
direction perpendicular to that axis. The outward direction of the blades of the impeller(s) at the 
periphery is forward relative to the direction of rotation, and the impeller may have one or two 
inlets.  
(3) Centrifugal radial bladed fan:  
A fan in which the gas enters the impeller(s) in an essentially axial direction and leaves it in a direction perpendicular to that axis. The outward direction of the blades of the impeller(s) a t the 
periphery is radial relative to the axis of rotation, and  the impeller may have one or two inlets.   
(4) Centrifugal backward curved fan (with housing) : 
A fan in which the gas enters the impeller(s) in an essentially axial direction and leaves it in a 
direction perpendicular to that axis. The outward direction of  the blades of the impeller(s) at the 
periphery is backward relative to the direction of rotation, the impeller may have one or two inlets , 
and which has a housing.  
(5) Centrifugal backward curved fan (without housing) : 
A fan in which the gas enters the im peller(s) in an essentially axial direction and leaves it in a 
direction perpendicular to that axis. The outward direction of the blades of the impeller(s) at the 
periphery is backward relative to the direction of rotation and which does not have housing.  
(6) Mixed flow fan : 
A fan in which the gas path through the impeller is intermediate between the gas path in fans of 
centrifugal and axial types.  
Note:  ”housing ” means a casing around the impeller which guides the gas stream towards, through 
and from the i mpeller;  
2. Excluded Items:  
(1) Fire-fighting smoke extraction fan: refers to  fans equipped with a high- temperature smoke 
exhaust motor, the relevant certification documents are submitted and approved by the Central  
6 
 Competent Authority. It can r efer to the regulations  of Outline Specifications in  for Public 
Construction in "Chapter 15835 Fans for Smoke Exhaust Equipment of Fire Fighting System" 
or the relevant provisions in CNS21927- 3.  
(2) Cooling tower fan: a  fan installed on the cooling tower for sale, and cannot be tested separately . 
(3) Jet fan: a fan designed and marketed specifically to produce a high -velocity air jet in a space to 
increase its air momentum. Jet fans are rated using thrust. Inlets and outlets are not ducted but 
may include acoustic silencers . 
(4) Induced -flow fan: a type of laboratory exhaust fan with a nozzle and windband; the fan’ s outlet 
airflow is greater than the inlet airflow due to induced airflow.  
3. While manufacturing or importing the products for domestic use, if the  Dealer  declares that it is 
not within the scope of application, or declares that the product is not for domestic  users , the Central 
Competent Authority may require the Deal er to provide relevant documents such as design data or 
shipment details when necessary.   
 
 
 
   
7 
 Appendix 2 
Minimum Energy Performance Standard Requirements for  Fans  
 
Fan types  Measurement 
category(A -D) Efficiency 
category  
(static or total)  Power range Pe in kW  Minimum Energy 
Performance Standard 
Requirements  Fan motor 
efficiency 
grade , FMEG  
(N) 
Axial fan  A,C static 0.75kW ≤ Pe ≤ 10kW η=2.74 ×ln( Pe )–6.33 + N 
40 
10 kW< P e ≤ 200kW η=0.78 ×ln( Pe )–1.88 + N 
B,D total 0.75kW ≤ Pe ≤ 10kW η=2.74 ×ln( Pe )–6.33 + N 
58 
10 kW< P e ≤ 200kW η=0.78 ×ln( Pe )–1.88 + N 
Centrifugal 
forward curved 
fan and 
centrifugal  
radial blade fan  A,C static 0.75kW ≤ Pe ≤ 10kW η=2.74 ×ln( Pe )–6.33 + N 
44 
10 kW< P e ≤ 200kW η=0.78 ×ln( Pe )–1.88 + N 
B,D total 0.75kW ≤ Pe ≤ 10kW η=2.74 ×ln( Pe )–6.33 + N 
49 
10 kW< P e ≤ 200kW η=0.78 ×ln( Pe )–1.88 + N 
Centrifugal 
backward 
curved fan with 
housing A,C static 0.75kW ≤ Pe ≤ 10kW η=4.56 × ln( Pe )–10.5 + N 
61 
10 kW< P e ≤ 200kW η=1.1 × ln( Pe )–2.6 + N 
B,D total 0.75kW ≤ Pe ≤ 10kW η=4.56 × ln( Pe )–10.5 + N 
64 
10 kW< P e ≤ 200kW η=1.1 × ln( Pe )–2.6 + N 
Centrifugal 
backward 
curved fan 
without housing  A,C static 0.75kW ≤ Pe ≤ 10kW η=4.56 × ln( Pe )–10.5 + N 
62 
10 kW< P e ≤ 200kW η=1.1 × ln( Pe )–2.6 + N 
Mixed flow fan  A,C static 0.75kW ≤ Pe ≤ 10kW η=4.56 × ln( Pe )–10.5 + N 
50 
10 kW< P e ≤ 200kW η=1.1 × ln( Pe )–2.6 + N 
B,D total 0.75kW ≤ Pe ≤ 10kW η=4.56 × ln( Pe )–10.5 + N 
62 
10 kW< P e ≤ 200kW η=1.1 × ln( Pe )–2.6 + N 
Note: 
1. Pe is the power measured at the mains input terminals to the motor of the fan when the fan is 
operating  at its best efficiency point  (kW), N is fan motor efficiency grade, and η is minimum 
energy performance standard requirements (%) in the table.  
2. Best efficiency point : means the maximum efficiency achieved at a point on its operating 
characteristic.  
3. The Measurement category of fans during the test is in accordance with the provisions of CNS 
7778, ISO 5801 or AMCA 210, among which  
A: refers  to free inlet and free outlet;  
B: refers to free inlet and ducted outlet ; 
C: refers to ducted inlet and free outlet;  
D: refers to ducted  inlet and ducted  outlet ; 
4. The measured energy efficiency values of the fan shall not be lower than the minimum energy 
performance standard requirements  η as calculated by preceding table and shall be higher than 
or equal to the to the rated values of product.  
8 
 5. The measured energy effici ency value of fans shall be calculated to the first place of decimal 
fraction and rounded up after decimal fraction. 
6. The measured energy efficiency value of fans shall be calculated according to the following 
formulas:  
Measurement category A or C  
 
𝜂𝜂es=𝑃𝑃us
𝑃𝑃e=𝑞𝑞×𝑃𝑃fs×𝑘𝑘ps
𝑃𝑃e 
 
Measurement category B or D 
       
𝜂𝜂e=𝑃𝑃u
𝑃𝑃e=𝑞𝑞×𝑃𝑃f×𝑘𝑘p
𝑃𝑃e 
 Where 
𝜂𝜂
es , 𝜂𝜂e : the overall efficiency of fan static pressure and fan total pressure respectively , at 
its bet  energy efficiency point (%); 
  𝑃𝑃us,𝑃𝑃u:  the fan static pressure gas power  and total pressure  gas power respectively,  at its 
bet energy efficiency point (kW). 
Q   ：i nlet stagnation v olume flow rate , at the best efficiency point(m3/sec); 
𝑃𝑃fs   ：the fan static  pressure ( KPa；KP a =101.97 mmAq ); means the fan total pressure 
(𝑃𝑃f ) minus the fan dynamic pressure corrected by the Mach factor , at the best 
efficiency point; 
𝑃𝑃𝑓𝑓    ：the fan total pressure ( KPa；KPa =101.97mmAq ); means the difference 
between the stagnation pressure at the fan outlet and the stagnation pressure 
at the fan inlet , at the best efficiency point;  
        𝑘𝑘𝑝𝑝𝑝𝑝,𝑘𝑘𝑝𝑝：the compressibility coefficient of fan static pressure and  fan total 
pressure respectively , calculated according to the equations under CNS 7778, 
ISO 5801 or AMCA 210.  
𝑃𝑃e     ： the power measured at the mains input terminals to the motor of the fan 
when the fan is operating  at its best efficiency point(kW).  
7. When the impeller diameter  of the ventilator differs within 5%, it is regarded as the same main 
model. When the impeller diameter differs by more than 5%, it shall be registered as a different 
main model.  
8. When applying for registration, the efficiency and related information of all  product 
combinations under the main model shall  be registered, and the measured energy efficiency 
values at the best efficiency point of all product combinations shall  not be lower  than the  
minimum energy performance standard requirements, and shall be higher than or equal to the 
rated value of product. 
 
 
 
 
 
 
  
9 
 Appendix 3  
 
Application Form for Minimum Energy Performance Standard  Management 
System Account and Password  
Prepared on (ROC year, month, date)  
 
Applicant (Company):                                                   
Applicant:             Tel:              Fax:                       
E-MAIL:                                                   
 
Category of the Product:                                       
Account ID:                                                  
Password:                                                    
 
This company is applying for log-in and use of Minimum Energy Performance Standard 
Management System, and will be responsible for all information registered.  
Stamp (seals of the company and the responsible person):  
 
   
 
             (official seals of the company and responsible person) 
 
   
10 
 Appendix  4 
 
   
Application form for registration of Energy Efficiency Performance Standard 
for Fans  
Prepared on (ROC year, month, date)  
1. Applicant (Dealer) Information  
Company name:                                          
Company address:                                          
Responsible Person:            Business ID:                         
Contact:             Department:             Title:             
Tel:               Mobile:               Fax:                  
Email:                                                    
2. Manufacturer Name and Address  
  □same as the Applicant  
Manufacturer name:                                          
Manufacturer address:                                        
3. Contents of RegistrationApplication number:                 
11 
 No. Product  
name Model 
No. motor 
rated 
power 
(kW)   
motor 
type/ 
Number 
of 
poles(P)  Rated 
voltage  
(V)/ 
Rated 
frequenc
y(Hz)  
 Measure
ment 
category(
A/B/C/D)  inlet 
conditions  Impeller 
diameter 
( mm)  Transmission 
connection 
methods  Vo l u m e  
flow rate 
at the best 
efficiency 
point  
(m3/min)  Static or total 
pressure at 
the best 
efficiency 
point  
(mmAq)  Rotation per 
minute at the 
best efficiency 
point  
(rpm) motor input 
power at the 
best efficiency 
point(kW)  Efficiency at 
the best 
efficiency 
point  
 (%) Fan motor 
efficiency 
grade  
 (FMEG)  fan  
dimensions   
Production 
country or 
region  
1.                   
2.                   
Note:  
1. Dealer shall log in the  Minimum Energy Performance Standard Management System to fill out the application form and download for further use.  
2. Measure category: expressing by  A, B, C, or D  
3. Inlet conditions: means single inlet or double inlet  
4. Fan motor efficiency grade ：expression by Actual measured FMEG / MEPS ,ex FMEG68/64  
4. Application  Declaration and Affidavit  
This company hereby declares to the Central Competent Authority that all information contained in this application is true, a nd this company will be 
responsible for false, if any, and bear all legal liabilities. This company hereby declares that products available on the markets shall have the same 
energy efficiency labelling information as given in this application form. In case of any false, this company shall, without any objection, be subject to 
registration revocation and  any disposition under the energy management regulations. 
 
Stamp (Seals of company and responsible person)   
 
 
 
 
 
(official seals of company and responsible person   
 
12 
 5. Power of Attorney (not applicable for applicants apply for registration by themselves)  
For those apply for registration through attorney(s), the attorney(s) shall be approved by the 
applicants.  
 
Company Name of the Attorney: 
Responsible Person: 
Address: 
Business ID:  
Tel: 
 
  
              
(official seals of company and responsible person )