Krueger’s CRFF series of critical room fan filter units are intended for environments that demand the highest levels of cleanliness such as laboratories, clean rooms and microprocessor assembly areas. Each unit contains an integral HEPA filter for improving contaminant and particulate removal from supply air. These devices combine quiet operation, low power consumption and a space saving low profile design to meet a variety of applications. Additionally, these devices are modular and can be used in nominally sized 24” x 24” and 24” x 48” grid systems.