Conventional Fume Hood | Variable Air Volume (VAV) Fume Hood | High Performance Low Flow Fume Hood | |
Working Principle | 0.5m/s (100fpm) @ full open sash position | 0.5m/s (100fpm) @ all sash positions with help of sophisticated control system | 0.3m/s (60fpm) 457mm (18") sash opening using advanced aerodynamic designs |
Initial cost | Low | High | Medium |
Running Cost | Very High | Low | Low |
Ease of installation, commissioning and maintenance | Easy | Difficult | Easy |