In the May issue of CONTRACTOR, several of the Book of Giants listings contained errors.

Comfort Systems USA, Houston, ranked Number 2 with revenues of $899.53 million, has HVAC revenues of $719.62 million, piping and sheet metal revenues of about $62 million and fire protection revenues of about $54 million.

Revenues for Limbach Facilities Services are $284.31 million. The firm is headquarted in Pittsburgh.

ACCO Engineered Systems, Glendale, Calif., reports revenues $20 million higher than listed at $380 million.

An editing error shifted revenues for Virginia Sprinkler Corp., Ashland, Va., COSCO Fire Protection, Orange, Calif., and McDaniel Fire Systems, Valparaiso, Ind., from the fire protection column into the sheet metal column.

J.F. Ahern Co., Fond duLac, Wis., ranked number 21 with revenues of $158.53 million, should have been listed as one of the Top 10 Companies in the Midwest.