A technical architectural blueprint detailing the heating system for the second floor of the Frank Residence, dated 1939-1940.

This architectural document provides a technical view of the heating system for the Frank Residence in Pittsburgh, Pennsylvania. Produced between 1939 and 1940, the drawing captures the precise engineering requirements for the second floor. The layout illustrates the distribution of air supply, recirculation paths, and the placement of specific heating units within the domestic space.

The drawing features technical annotations, including details for towel dryers and bedroom heating units. The lines are thin and precise, characteristic of mid-century drafting practices where clarity and functional accuracy were the primary objectives. The document serves as a record of the mechanical systems that supported the residential architecture of the period. It displays the systematic approach taken by architects and engineers to integrate climate control into the structure of a private home.

The composition is functional, prioritising the legibility of the floor plan and the associated mechanical schematics. The annotations provide specific instructions regarding air supply and exhaust, reflecting the technical rigour applied to the residence. As a piece of architectural ephemera, this print offers a view into the hidden infrastructure of a 1930s home. It is a document of mid-century design, focusing on the intersection of residential comfort and industrial engineering. The monochromatic palette and clean lines make it a suitable choice for those interested in the history of architecture, engineering, or the aesthetic of technical drafting.