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Explicit manufacturer interchange
Sterling Electric 525/2525BQ appears in the same manufacturer-published cross-reference row as Leeson Ironman BMQ852 at Match installed ratio · 5.25 in center distance.
Sterling Electric explicitly marks the listed competitor models "Yes" for interchange with 525/2525BQ at 5.25 in center distance in its 2000RA Style BQ Interchange Guide. Rows marked No are intentionally excluded.
The manufacturer explicitly marks the compared model as an interchange in its published table.
Leeson Ironman BMQ852 and Sterling Electric 525/2525BQ are tied by the published source at Match installed ratio · 5.25 in center distance.
Still verify the exact configured ratio, input/output interfaces, duty, accessories, and installation conditions.