Heating and Ventilating Shops and Offices (Classic Reprint)

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Excerpt from Heating and Ventilating Shops and OfficesThe principal feature in the patented vacuum systems is the auto matic valve placed at the return end of the coil or radiator which opens only to allow the passage of air and water, and closes in the presence of steam. If the ordinary radiator valve is used and left wide'open.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.