Packard PM43440 Transformer This HVAC flue seal is

This HVAC flue seal is compatible with Reznor gas-fired unit heaters including several series of the UDSA

Ensure the heat exchanger is clean and the fan is operating at the correct CFM before replacing the switch

For service technicians and mechanical contractors

This is an O-ring style Rotalock seal

this sensor is commonly used in units branded under Heil

Packard PM43440 Transformer This HVAC flue seal isThe Packard PM43440 is a versatile 40VA Class II control transformer engineered for reliable performance in demanding HVACR applications. Designed for maximum field flexibility, this multi tap transformer features primary voltage inputs of 120V, 208V, and 240V, making it a "truck stock" essential for residential and commercial service calls. The secondary side provides multiple output options at 24V, 12V, and 2. 5V via standard wire leads, allowing