it meets strict NEC requirements for "not wet" applications

70" WC rating is specific to the heat exchanger’s airflow requirements

By keeping the oil warm during the off-cycle

maintaining a reliable seal under varying thermal loads and system pressures

It is not rated for the amperage requirements of HSI silicon carbide or nitride igniters

ZoneFirst ZDSM-32X20 Damper R-410A it meets strict NEC requirementsThe ZoneFirst ZDSM 32X20 is a heavy duty rectangular zone damper designed for high performance airflow management in residential and commercial HVAC systems. Featuring parallel blade construction, this 32" wide x 20" high unit utilizes a 24Vac synchronous motor for reliable power open and power closed operation. Engineered with an extruded aluminum frame, the ZDSM 32X20 provides superior structural integrity and corrosion resistance compared to