The Raypak 010745 D-2 Pool Heater Power Vent is a fan-assisted combustion system compatible with Raypak electric ignition heater models 336/337 and 406/407. This durable vent is ideal for new and existing installations and features a blower motor using 120V, as well as a plenum for quality operation. Meeting ANSI standards, it includes a draft-proving switch to ensure operation and measures 18.31" x 7.91".