the 3JN provides superior resistance to oil and chemical exposure compared to standard EPDM alternatives

While physically compatible with many housings

reducing delayed ignition and optimizing the combustion start sequence

Is the Allanson 2721-668 compatible with older 2721-668SF models

Modine 3H0373620003 Vent Assembly 322838-754 the 3JN provides superior resistanceThe Modine 3H0373620003 Vent Assembly is a high performance OEM replacement power venter engineered for heavy duty air management in industrial and commercial heating applications. This power exhaust assembly is specifically designed for compatibility with Modine PTS, BTS200, BTS350, and BTS400 unit heater models, ensuring safe and efficient removal of combustion byproducts. As a genuine Modine furnace part, it facilitates the essential pressure drop