Raypak Power Vent for 206 and 266K BTU Heaters Features and Benefits Power Vent Kit Works with all Raypak Digital Pool Heaters Suitable for indoor and outdoor use Certified for American National Standard ANSI Z21.56 All models have a 4" diameter exhaust connection and must be vented with stainless steel gas tight venting Equipped with a solid state control that allows the blower to purge any residual gas buildup in the heater after the heater has shut down