By integrating this HVAC safety limit switch

the B55 features a wrapped cover for smoother operation and better slippage tolerance

ensuring smooth power transmission in tight-clearance equipment

shifting the system to "Away" settings if no motion is detected

Authentic OEM replacement part ensures perfect fitment and maintains the factory-engineered pressure balance

BROAN-NuTone S99271493 Thermal Cutoff 318172-701 By integrating this HVAC safetyThe BROAN NuTone S99271493 Thermal Cutoff is a critical safety component designed for over temperature protection in ventilation and heating systems. As an OEM authorized part, this thermal fuse is engineered to provide a precise fail safe mechanism, automatically interrupting the electrical circuit when temperatures exceed calibrated safety thresholds. This prevents potential thermal runaway and protects sensitive components like heating elements and