The elastomers in the 323-468 kit are typically rated for air

Max Temperature: 250°F (121°C)

Plenum Rated: UL listed for use in air handling spaces

while the NEMA 1 enclosure protects internal components in controlled environments

baking ovens

Nordyne 903107 Roof Jack Extension 323269-701 The elastomers in the 323-468Optimizing a standard HVAC venting system often requires precise adjustments to the vertical stack height to clear local structural obstructions or meet specific residential building codes. The Nordyne 903107 Roof Jack Extension provides a rugged 18 inch internal roof jack extension designed to bridge the gap between your furnace or mobile home heating system and the exterior roof jack assembly. Engineered for rigorous duty cycles, this HVAC