Original old industrial vintage catalog for KNOWLES MUSHROOM VENTILATOR COMPANY of New York City, NY. Air controlling heads used in connection with mechanical systems of air purifying or ventilation, for controlling the distribution of the supply of fresh air or the exhaust of vitiated air. Valuable in the ventilation of auditoriums of theaters, schools, public buildings and large rooms in manufacturing establishments. Shown are the notch and damper air controlling heads. Was located at 9 Church Street. Disbound from a large 1916 engineering book, this one page unique technical data specification sheet contains a small amount of residual glue. It would display beautifully matted and framed.
- SKU zb758
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