A guide device for directing a gas through gas pressurizing device, includes at least one part-ring shaped guide member having a pair of opposite first end and second end defining a gap therebetween, a lip extending from the guide member, and at least one groove configured in the gas pressurizing device to receive the guide member. The guide device provides a smooth passage to gas flow through a gas pressurizing device by directing gas through the gas pressurizing device, so as to improve efficiency and performance of the gas pressurizing device and eliminate need of fasteners, holes or brackets. The guide device is easy to mount in a gas pressurizing device as compared to conventional baffle ring.