The shape is strictly for physical mounting compatibility

The Bard 8402-031 Limit Switch is a critical safety component designed for high-limit temperature regulation in Bard HVAC systems and wall-mount units

and public hallways

restricted airflow

38 NPS (National Pipe Straight) male thread

Resideo AT140A1018 Transformer The shape is strictly forThe Resideo AT140A1018 Transformer is a heavy duty 40VA power solution designed for high demand 24Vac circuits in residential and commercial HVAC systems. This multi tap HVAC transformer features flexible primary voltage inputs of 120V, 208V, and 240V, converting power to a stable 27V secondary output. Engineered for versatility, it supports foot mounting, plate mounting on 2"x4" or 4"x4" outlet boxes, and clamp mounting via knockouts. As a Class 2