Book 3 — Catch-All Screen inside Hot-Air Register
Reading edition
In order to recover small articles dropped through the floor-register grating of a hot-air heating system without the necessity of removing a section of the pipe, mesh gratings like that shown were fitted into place. Number six gauge wire mesh was used in pieces just large enough to fit into the metal box below the register. Access to the screen may be had by removing the grating—F. M. Ball, St. Louis. Mo.