Hayward UHXPOSHZ11501 Positive Pressure H150fd Indoor Vent Adapter Horizontal Replacement Kit for Hayward Universal H-Series Low Nox Gas Heaters
The Hayward Universal H-Series Low NOx is designed specifically for either a positive-pressure or negative-pressure venting system, both have their own factors that determine which one is the best fit. Positive is based toward a more horizontal venting system, where the heat rises less and therefore causes more condensation that will cause rusting, and possible damage to the pipe. The Universal H-Series is an energy efficient, high performance, installation adaptable commitment to the pool service professional.
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