The fan shall be the axial fan which adopts propeller-type axial wheel. The drive type shall be direct-drive.
- Quality Standards
The fan shall be tested in accordance with AMCA Standard 210 and 300. The manufacturer must own the production license for industrial products and ISO9001 quality system authentication.
Impeller shall be propeller-type axial impeller with the blade of carbon steel (CS) (static applied epoxy powder coating surface treatment) [optional:
aluminum blade (AL)/ stainless steel blade/ FRP blade] material. The impeller shall be statically and dynamically balanced to Level G2.5 as per AMCA204 standard. The fan shall keep stable airflow and low noise at maximum speed. The fan shall effectively avoid performance degradation caused by slide of operating point.
- Wind Band
The wind band shall be constructed of heavy gauge galvanized steel with [or: stainless steel] a rigid internal support structure. The wind band profile shall be of the streamline type; the structure shall be of the multi reinforced rib type to protect the fan from wind overload; and the external surface shall be pitched to quickly drain rain and snow by gravity.
Motor shall be carefully matched to the fan load and its protection grade shall be IP54, while insulation class F and temperature rise B. The motor bearing shall be self-lubricating ball bearing. And TEFC, 2-SPD, EXP, VFD, 60Hz and other correct motor types must be selected according to the specific working conditions.
- Explosion-proof Structure (Only for explosion-proof type)
Fan shall conform to Spark B explosion-proof structure according to AMCA99 Standard. The impeller shall be constructed of aluminum, the inlet shall mount copper ring and the motor shall adopt explosion-proof type. The whole fan should own CNEX certification and the manufacturer must own the production license for anti-explosion electric products.
Permanently fixed aluminum nameplate shall be fixed on fan body clearly display fan mark, product model and serial number (i.e.: unique ID for each fan), so that the customer can use this number to find out the parts used.
- Acceptable Manufacturers
Qualified suppliers shall have an AAA credit rating. Providing INFINAIR or similar products, with their design based on YFRTX models of INFINAIR.