TY - RPRT TI - Air delivery performance of a Rittling unit ventilator under isothermal conditions : manufactured by the Rittling Corporation Hamburg, New York AU - Davis, Joseph C PY - 1963 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS report ; 7800 DO - 10.6028/NBS.RPT.7800 ER -