Reznor 121275 Unit Heater Block Vent Switch

Reznor 121275 Unit Heater Block Vent Switch is a precise replacement component for Reznor unit heaters. The block vent switch is designed for 275D models and fits a 36T X46 footprint to ensure a snug, problem-free installation.

In industrial HVAC applications, this block vent switch coordinates vent control with burner cycles, supporting safe startups and reliable shutdowns. Built as a robust Reznor heater part, it provides a dependable, standard solution for replacing worn or malfunctioning switches in 275D systems.

This unit heater switch helps minimize downtime and keeps maintenance schedules on track. As an HVAC replacement part, it restores proper vent operation and helps maintain consistent heating performance across compatible Reznor installations.

Designed for easy installation and durable operation in demanding environments, the 121275 block vent switch offers long service life and steady performance in commercial and industrial settings.

• Part number: 121275
• Compatibility: Reznor 275D unit heaters
• Type: Block vent switch
• Fitment: 36T X46 footprint
• Durability: Built for industrial environments