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1945 Theatre Catalog, 4th Edition, Page 514 (488)

1945 Theatre Catalog, 4th Edition
1945 Theatre Catalog
1945 Theatre Catalog, 4th Edition, Page 514
Page 514

1945 Theatre Catalog, 4th Edition, Page 514

CEILING FIXTURES like this one can be utilized in some portions of the theatre. The effectiveness of upper room air irradiation is obviously dependent upon the amount of circulation between the upper and lower areas, and the effectiveness of any installation can be greatly increased by forced air circulation. Ceiling fixtures of this type might, at times, be combined with fluorescent lighting. (General Electric Company photograph.)

fections that bring, in addition to more serious respiratory diseases, an estimated 400,000,000 colds a year with an annual loss in man-hours of around a billion dollars. Germicidal lamps can be effectively used in two types of installations in overhead fixtures and in the air ducts of ventilating and air conditioning systems.

Fewer than five changes of air an hour by door and window leakage repre sent average indoor winter ventilating conditions, which are universally regarded as bad. Because of the cost of heating outside air and the mechanical difiiculties of circulating it, 15 to 20 additional changes of air are about all that can be secured by artificial means. It is believed that a sanitary ventilation of approximately 100 changes an hour is necessary to secure any marked reduction in the transmission of respiratory infections. With a correctly engineered installation of GE germicidal lamps, it is entirely practical to secure a sanitary ventilation equivalent to 100 air changes per hour.

The en'ectiveness of upper room air irradiation is obviously dependent upon the amount of circulation between the

lower and upper areas, and the effective ness of any installation can be greatly increased by forced air circulation. The amount of sanitary ventilation needed in any particular interior depends, among other factors, on the rate of contamination, generally proportional to occupancy, are relatively short.

Operation costs are relatively low. Depending on the amount of sanitary ventilation needed, assuming a maximum of 10 hours, operation a day, an average electric rate and a conservative life rating of the lamps, the operating and lamp

. replacement costs will range from one half to three cents a day for each 1,000 cubic feet of room volume. As an example of installation expense, the original cost of a school installation can be written off in a year at the rate of only 21/2 cents per 1,000 cubic feet per day of school operation.

The bactericidal ultraviolet barrier that can be created by General Electric germicidal lamps is comparable with the direct method of air irradiation in its effectiveness and in the uniqueness of the service they perform.

Although there are many ways of in WALL FIXTURES can be adapted to theatre auditorium use. Designed to beam a stratum of sanitizing ultraviolet light above the eye level, this wall fixture is used in areas where space is limited. A similar fixture has been designed to be used over doorways, where it is comparable with the upper-air method in effectiveness and the downward component also forms a definite germicidal layer in the air. (General Electric Company Photograph)



stalling germicidal lamps in air ducts, the best compromise on the radiation and mechanical factors calls for placing them lengthwise on the duct wall, on 4- to 5-inch centers grouped on center half of the duct wall and out of the corners of rectangular ducts. Standard wiring channel strips, such as are used with the corresponding fluorescent lamps, may be attached to the outside walls of the duct with the lamp sockets projecting through holes in the duct walls and the reflector lining. 'Two-lamp assemblies using highpower factor ballasts and moisture proof lamp holders, especially designed for this type of installation, are commercially available.

Since, for edective operation, the germicidal lamp tubes must be kept reasonably free of dust, there must be convenient access for cleaning. This can usually be arranged by hinged panels on the sides or bottom of the duct, and, if necessary, the lamp may also be mounted on these panels as well as on the stationary duct walls. Where the mechanical conditions demand it, lamps may be installed end to end along the duct.

In any case, the reflector lining of chromium or aluminum should be used on all walls of the duct, and should extend beyond the ends of the lamps a distance twice that to the opposite sides of the duct. If chromium plated sheet steel is not available, aluminum foil surfaced building paper or board, or special aluminum paints may be used for the duct lining.

In large ducts or plenum chambers, germicidal lamps may be assembled like the rungs of a ladder in vertical frames, supported out in the center of the chamber in whatever series or multiple arrangement best fits the local conditions and provides access for cleaning and replacement.

In addition to the specific value of germicidal lamps in materially reducing certain types of infection, their general value to the theatre owner or operator lies in the fact that these lamps provide a new means of disinfecting air. Germicidal lamps oHer a simple method of protecting patrons of amusement places against air-borne infection, an unique means of additional sanitation since there is today no other practical way of doing the job.

During the past war years, germ-killing ultraviolet light as generated by the GE germicidal lamps has been widely tested and effectively used in hospitals, schools and army barracks. Today, the germicidal lamp has definitely emerged from the experimental stage as a practical, inexpensive weapon against many air-borne infections. In the theatre, it has not only a practical, public service value, but a specific box-office value, particularly so in periods when colds and infiuenza approach epidemic proportions. The promotional possibilities of a germicidal lamp installation will be immediately apparent to every alert theatre operator.

Hanovia Safe-T-Aire Lamps

Hanovia Chemical and Manufacturing Company, pioneers in the design and manufacture of ultraviolet equipment, at an early period had developed low pres CATALOG#1945
1945 Theatre Catalog, 4th Edition, Page 514