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1948-49 Theatre Catalog, 7th Edition, Page 450 (437)

1948-49 Theatre Catalog, 7th Edition
1948-49 Theatre Catalog
1948-49 Theatre Catalog, 7th Edition, Page 450
Page 450

1948-49 Theatre Catalog, 7th Edition, Page 450

of Health, U. 5. Public Health Service are studying and reviewing the promising results obtained with glycol as the germicidal agent. Installations in Johns Hopkins Hospital in Baltimore, and Bellevue Hospital, New York (to control the spread of such virus diseases as mumps and measles) are now being tested with highly favorable results. The Seamen's Bank installation in New York, scene of the discovery of triethylene glycols anti-germ action, has been examined by hundreds of individuals representing health groups, drug manufacturers, insurance groups, health commissioners, tobacco manufacturers, and epidemic control groups from South America.

There are several important factors to be considered in making a glycol installation. It is necessary that the Vapor be properly and continuously dispensed through the entire Space to be treated, for the following reasons: (1) Fifty to 70 per cent of the glycol vapor dispersed into the air is lost rapidly by condensation on surfaces and air-borne dust particles. Further loss is caused by the exchange of airgopening doors or windows; (2) Aerial contamination of inhabited spaces is a continuous process, hence, bactericidal concentrations of the vapor must be present constantly; (3) The killing action of the glycol while very rapid for freshly expelled bacteria, requires some time for the' dried microorganisms originating from secondary reservoirs; and (-1) Since triethylene glycol has little tendency to diffuse by itself, thorough mixing depends on air currents which in most situations must be induced artificially. In an air-conditioning system, even distribution of the vapor is assured if the system has been properly devised. In existing buildings without air conditioning duct-work, separate ducts or several vaporizers may be used.

Since triethylene glycol has such a low vapor pressure (boiling point is 5500 F.) it is necessary to use heat for vaporization. The temperature which can be employed is limited by the fact that this glycol begins to decompose when heated above 30W F. In order to obtain sufficient vapor at this relatively low temperature, extended evaporating surfaces must be provided. The glycol vaporizers now being made employ either this principle or that of boiling mixe tures of glycol and water.

There are two installations of more than academic interest for theatre men. One of these is the Seamenis Bank. where a surprising improvement in the health of the personnel first focussed attention on the remarkable germicidal properties of TEG; the other is the Rivoli Theatre in New York, where the first conmiercial theatre application made its debut.

At Seanien's Bank, permanent triethylene glycol vaporizers have been installed throughout thc air-conditioning system, augmenting the chemical's use as a dehumidifying agent. The central conditioning system consists of a double bank of air iilters, dehumidifier, a concentrator that restores depleted glycol to full strength. refrigerating compressors that remove the air's sensible heat,


blowers, necessary control elements and glycol vaporizers. Supplying 300,000 cubic feet of space, the system furnishes six complete air changes per hour at relative humidities of 48 to 52% and glycol relative saturation of 60 to 70%. Temperature difference is 12 to 150 F. on maximum days and 5 to 100 F. when outside dry-bulb temperature is 850 F. or less.

During winter months, 100% fresh air is filtered, humidified with steam, heated and sterilized before delivery to each of four separate zones. In summer, 65% recirculated and 35% fresh air is dehumidified, sterilized and cooled. Two Freon-12 condensing units (15 and 25 tons), serve a chilledewater system that cools the air. Twelfth floor offices are divided into two air-control zones: one supplied by two 31/2-ton unit conditioners and vaporizers and the other by a central condensing unit supplying Freon-12 to window units in each of twelve offices. A fourth unit conditioner and vaporizer in the basement serves the safety deposit vault.

In its general aspects, the glycol vapor installation at the Rivoli Theatriin New York City is similar to the system at Seamenfs Bank. Patrons react favorably to the treated atmosphere, commenting on the pleasant smell of clean fresh air, or referring to the protection afforded children by glycol purification. Even more enthusiastic are the Rivoli personnel who live in the purified air most of the week and who probably welcome the insulation from a constant bombardment of new germs at each show.

The cost of operation at the Rivoli, a large metropolitan theatre, for their glycol vapor installation-based on an 18 hour daysruns approximately $16.00 a month. In the average size theatre, this cost would be substantially lower, about $6.00 to $8.00 a month. These extraordinarily low figures make it pOS sible for practically all theatre operators to provide their customers with germ-free air at no extra cost. Home was never like this!

Glycol vapor installations are beginning to appear in more and more moving picture houses as operators learn of the efficiency, the value and the remarkable economy in operation of these air purifiers. Among theatres now offering this service to the public (besides the Rivoli Theatre in New York) are: the Fox Theatre in Toledo, Ohio; and the. Kearse Theatre, Charleston, West Virj ginia.

The motion picture industry is fortunate in having access to a germicide as potent and yet so adaptable as triethylene glycol. TEGis discovery as a germkiller is comparable in a way to the discovery of penicillin, the sulfa drugs, or some of the other miracle medicines of recent years. It even has an advantage over these shortvcut cures-it acts to prevent sickness and it does this so successfully that the theatre may eventually become a haven of purer air than even the great outdoor spaces offer. And all this on a modest budget, too.

For the interested operator who wishes to learn more about triethylene glycol, the painstaking research which verified its numerous capabilities and the engineering data,governing its installation, there is a large body of reference material already and this is being added to at a rapid rate. According to all reports, triethylene glycol is one of those happy products that operators swear by and not at.


The editors wish to thank Air Purification Service, Inc., and Carbide and Carbon Chemicals Corporation, for their very kind assistance in contributing information on triethylene glycol for this article. '

THE GLYCQL VAPOR INSTALLATION at the Bivoli. New York. and several other theatres throughout the country 15 Simple and compact and may be made in the duct system or plenum chamber as desired.
1948-49 Theatre Catalog, 7th Edition, Page 450