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1948-49 Theatre Catalog, 7th Edition, Page 458 (445)

1948-49 Theatre Catalog, 7th Edition
1948-49 Theatre Catalog
1948-49 Theatre Catalog, 7th Edition, Page 458
Page 458

1948-49 Theatre Catalog, 7th Edition, Page 458

100% diffusion pattern control and more rapid temperature equalization.

Designed by a group of engineers with more than 35 years experience in the handling of air, the Agitair provides the architect and engineer with the only diffuser that is tailor-made to fit their design, instead of requiring them to make their design conform to the diffuser.

The architect or engineer specifies his requirements; the Agitair diffusers are then designed and manufactured to his specifications. These specifications include drawings showing construction, all physical dimensions and method of connecting the diffusers to the duct work. These' drawings indicate areas in square feet, air velocities in feet per minute in the neck and at the point of discharge, and air pressure in the neck of the diffuser.

Diffusers are then assembled to meet the requirements, and to give one, two, three or foureway blow, with each side delivering a quantity of air directly proportional to the area it serves.

The fact that the air streams from the separate orifices are discharged at varying angles creates a high degree of turbulence in the combined primary air stream. The discharge velocity is sufficiently high to develop an aspirating effect that draws room air toward the diffuser, where the turbulence mixes it with the delivered air in 50/50 proportions. Three-way diffusers, moreover, draw air from one side in addition to that drawn upward from beneath the diffuser; two-way diffusers aspirate room air from below and from two sides. One-way diffusers perform much like side wall grilles, except that the velocity of the discharged air is dissipated more quickly because of the turbulence created by the Agitair vane design.

The aspirating and mixing action is checked by temperature readings taken at a 1 foot distance from the orifices. At this point, the temperature differences between incoming air and room air shall have been reduced by one-half, the manufacturer guarantees; and the remaining temperature equalization shall be completed before the blended air stream reaches the extremities of the space it serves.

To further emphasize the functioning of the Agitair, visualize a puff of smoke being drawn upward toward the diffuser. Here you see the mixing action of the room air and the primary air stream. The smoke coming in contact with the Type R diffuser, mushrooms out and clings to the ceiling until it has reached the end of the blow, where it gently feathers down without any noticeable air movement to cover the area it has been designed to serve. With the air motion within the zone of occupancy not more than fifty (50) nor less than twenty-five (25) feet per minute, there IS no sudden icy blastgor drafts. The patented construction of the Agitair assures the distribution of draftloss air and equalizes the temperature to avoid any cold blasts that might cause sudden Chilling of patrons.

While its basic, patented construction


THE OUTER LOBBY of the Madison. Covington. Kentucky, is amply and efficiently ventilated by Agitoir diffusers in the ceiling. These also provide four-way blow and 100 per cent control.

permits the Agitair diffuser to be assembled in numerous patterns to give the diffusion required for areas of any irregular shape, still closer control is afforded, where needed, by directional louvres and dampering devices available for use with it.

The utmost in flexibility is thus avail able. For example, the Agitair diffuser need not be centrally located. If such placement does not agree with the decorative pattern, or if a beam is in the way, or if it is not convenient to run a duct to the center of a ceiling area, the diffuser can be designed for any location the architect wishes to specify.

AGITAIR DIFFUSERS installed in the sidewall of the interior lobby of the Madison. Covinglon. Kentucky. control the distribution of air in three directions to assure noiseless-drafiless ventilation.
1948-49 Theatre Catalog, 7th Edition, Page 458