these are the same physical part

Direct OEM replacement for part number 297207R

If your diagnostics confirm the existing motor is failing to reach the necessary RPM or the wheel is obstructed

matches the rotational requirements and bore dimensions necessary for a seamless drop-in fit

When configured for 1500W

Siemens Building Technology 243-0011 Relay 318820-201 these are the same physicalThe Siemens 243 0011 pneumatic relay is a versatile heavy duty analog relay designed for demanding commercial HVACR control environments. This multi function auxiliary device operates on a force balance principle, utilizing a Powers two valve design to maintain system stability and eliminate unnecessary air consumption. Built as a rugged die cast model, it features 1 8" NPT air connections for supply, output, and both direct and reverse acting inputs,