The B317 is a 56 frame motor

How do I verify if this 12x12 wheel fits my unit

For applications exceeding these limits

This unit is built for commercial HVACR applications where industrial water heating or space heating requires tight tolerance control

Lau 05099801 Pitch Gauge Tool 320819-301 The B317 is a 56Professional grade fan blade pitch identification is critical for ensuring system efficiency and preventing motor overload. The Lau 05099801 Pitch Gauge Tool provides a precise, physical reference to determine the exact degree of propeller pitch and rotation direction on any blower wheel or fan blade. Built for the rigors of field service, this HVAC diagnostic tool eliminates the guesswork involved in selecting replacement fan blades, ensuring that