FED-STD-49D, FEDERAL STANDARD: FANS, CIRCULATING, COLUMN (ELECTRIC, RIGID-BLADES NON-OSCILLATING, NOT FOR MARINE SERVICE) (31 MAR 1976)

FED-STD-49D, FEDERAL STANDARD: FANS, CIRCULATING, COLUMN (ELECTRIC, RIGID-BLADES NON-OSCILLATING, NOT FOR MARINE SERVICE) (31 MAR 1976)., This standard establishes one size of air-circulating fan of the column type (pedestal type) and one guard type as the standard size for the use of all federal agencies to achieve the highest practical degree of standardization.