NPL – NPL ALU
Plenum Fans With High-Efficiency Steel Or Aluminium Wheels With Backward Curved Blades
COMEFRI high-performance centrifugal impellers NPL and NPL ALU have been designed for clean or slightly dusty air, to achieve the best possible aerodynamic performance when not fitted within a conventional fan housing.
The NPL impeller is manufactured in steel, with backward curved blades and a painted finish.
The NPL ALU impeller is manufactured in aluminum.
The special aluminum alloy tested and used to realize these wheels, the development of the specific rotating diffuser, similar to the one present on the NPL and NPA in steel, and the optimization of the welding process used offer the possibility at Comefri S.p.A. to propose on the international market these new series of wheels that flank and extend the series of painted steel wheels.
The low total weight given by the aluminum alloy allows less load on the bearings (longer bearing- life), and lower extra-load added on the structures concerned by installation, also contributing to a reduction in self-induced vibrations.
The aluminum alloy used, thanks to its excellent resistance to corrosion, ensures the maximum flexibility to use these wheels in any environment and industry; it also be nontoxic, non-magnetic, and easy to clean.
It is ERP 2015 compliant.
CO.ME.FRI. S.p.A. certifies that the high-efficiency free wheels backward curved NPL and NPL ALU for plenum fan are licensed to bear the AMCA Seal. The ratings shown are based on tests and procedures performed under AMCA Publication 211 and AMCA 311 Publication and comply with the requirements of the AMCA Certified Ratings Program.
| Dimensions NPL ALU | 200 – 225 – 250 – 280 – 315 – 355 – 400 – 450 – 500 |
| Dimensions NPL steel | 250 – 280 – 315 – 400 – 450 – 500 – 560 – 630 – 710 – 800 – 900 -1000 – 1120 – 1250 – 1400 |
| Volume | up to 135.000 m³/h |
| Δpt max | 2.800 Pa |
| Pwmax | 70 kW |
