Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 203
A/R valve: ^ PLAN AT SUPPLY e/VO FRONT V/EW S/D£ V/EW … Fig. i:!8. Heater Especially Adapted to Ventilation where Air does not Have to above 70 to 80 degrees F. be Heated air through it. In ordinary work it is customary to assume a velocityof SOO to 1,000 feet per minute; higher velocities call for a greaterpressure on the fan, which is not desirable in…
Architecture · Building · Carpentry
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