Efficient, vs operating at the lowest speed. High efficiency may be lost in a short time. Seals, or clearances wear so in practical terms the extra efficiency isn't here for the long run with out a continuous up keeping. Which may not be available. Thing that run slow - tear themselves apart slow. A 3600rpm fan will squeal then shortly shutdown. A low speed fan will run for days.
~Paul Ozment, Engineering Consultant, Detreoit, MI
Square type centrifugal fans, backward curved impellers, motors installed on top.
~BERNARDO TREWIK, General Management, SANTIAGO, CHILE
Increased efficiencies, quieter, longer life, lower vibration levels
~Engineering, Design, Pretoria, South Africa
1. Light weight
2. Variable speed
3. Adjustable static pressure
~Mathiyalagan K, Engineering Consultant, Anand, India
Compact and maintenance free unrustable sound less construction.
~Inder V, Technical Support, Silvassa, India
Best efficiency in the world and the lowest noise ever.
~Bert T, Engineer, Stockholm, Sweden
Ease of installation (retrofit). Quiet operation.
~Marv B, Retired homeowner, Montrose, CO
Greater efficiency and power consumption
~Chin Y, Engineering Consultant, Shanghai, PRC
High air flow
~Sompong Vongpanyaporn, Managing director, Bangkok, Thailand
Better noise criteria level
~JOJO C, President & General Manager, Las Pinas City, Philippines
More efficient, lower noise
~Hans S, Design Engineer, Wald, Switzeland
Fan manufacturers data
~Alan B, Commissioning & Balancing Technician, Melbourne, Australia