Raypak 010745 D-2 Indoor Power Vent 120V for Models 206A-408 - The D-2 Power Vent assembly is a Category III mechanical draft venting system that operates with a positive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent. All sizes are capable of relieving flue gases up to a maximum of 100 equivalent feet of vent length. All models have a 4” diameter exhaust connection and can be sidewall terminated using field-supplied cat III-certified vent material. Use the factory-supplied screened elbow as a downturned sidewall vent termination.