Document pzrj91Qm40OZgkNY24xoYOQw

Metal Weather Strips Chamberlin Metal Weather Strip Company Incorporated General Offices: Detroit, Mich. FACTORIES Detroit, Mich. Peru, Illinois ATLANTA BALTIMORE BOSTON BUFFALO CHICAGO DISTRICT BRANCHES CINCINNATI CLEVELAND DENVER DETROIT KANSAS CITY LOS ANGELES MINNEAPOLIS NEW YORK PHILADELPHIA PITTSBURGH ST. LOUIS WASHINGTON. D. C. WILKES BARRE 60 Sub-branches throughout the United States Comfort with fuel economy is the aim of the engineer designing a heating and ventilating plant for any type of building and it is, therefore, essential that he have complete information on weather strips when determining heat losses from a structure. Recent tests made by the The width of the groove American Society of Heat ing and Ventilating Engi neers in cooperation with CHamberUN in comparison with the metal member is the deter mining factor, otherwise the American Institute of Architects at the experi H^STNCS 1833-TME SUMDAKT5^ the groove might just as well be inch wider. A ment station of the U. S. testing apparatus built to Bureau of Mines, Pittsburgh, are of duplicate the conditions of the test at interest to the engineer, architect, con Pittsburgh and which checked the tests tractor and their clients and the results made at Pittsburgh proves this con are cited to aid the engineer in judging the clusively. value of weather strips. If the lateral expansion of white pine in a The rib type of weather strip is used in groove 62 inch wide is but 0.004 inch in 90 per cent of the installations made and . width from a thoroughly dry condition to it is universally agreed that the tongue a thoroughly wet condition, then a clear and groove principle is correct from a ance of H2 inch (0.0313) is allowing nearly practical standpoint. The weather strip eight times as much as is necessary becomes a part of the frame and engages in a groove in the sash insuring positive contact at all times and one that does not to take care of the expansion of the wood. In regular installation it isn't practical to become disengaged after a few years use. allow only Q.004 inch and the standard The width of the groove is the determining factor in the efficiency of the weather strip. In the official report covering the test made on this type of weather stripping is a paragraph which reads: "The Rib Type strip has one metal member fas tened on the frame which fits into a groove ploughed in the sash by the carpenter applying the strip. The width of this groove in comparison with the width of the metal member may be the determining factor in the leakage through a window to which this type of strip is applied. In .this instance, the rib was H in. wide and the groove 1/32 in. wider. DeVoIson Wood (A. S. M. E. Transactions, Volume No. 10) gives the lateral expansion of white pine as 2.6 per cent from dryness to saturation. With the groove 5/32 in. wide a variation of 0.004 in. in width is given from one-extreme to the other. Though most sashes at the present time are made of some less expensive wood, such as-Cypress or Spruce, it is prpbable that the expansion of either would not be .much greater than white pine. Therefore, the clearance allowed here would be ample in any case." grooving plane for the Chamberlin Rib Type allows a clearance of 0.012 inch, this being three times the expansion of the wood anc| sufficient under all circum stances. But--in the test on the Rib Type at Pittsburgh, the groove clear ance was nearly three times as much as ordinary practice. Inasmuch as the Chamberlin Rib Type has been installed successfully for a period of thirty-three years, and the experience of these thirty-three years tells us that a clearance of 0.012 inch is ample for ordinary conditions, it is fair to assume . that that clearance should be allowed. A comparison of the figures of the follow ing table shows very clearly the different 412 TTT Chamberlin Metal Weather Strip Co., Inc. Metal Weather Strips results obtained when the groove for the Rib Type strip is made in accordance with the standard that has been in vogue for thirty-three years. The conclusions obtained at the Pitts burgh and other tests necessarily do not take into consideration the time element. It was not possible in a laboratory test of this'kind to determine what the result would be after a period of years. That this time element is a big factor is recognized from the Official Report which reads: "The most important factor in .the problem of infiltration has been the subject of much discussion and is not yet definitely determined. This factor is the clearance of the average window after it has been in service a sufficient length of time to have reached its final condition in regard to .shrinkage which is a question for architects and heating engineers to decide. A simple solution to the prob lem can be obtained by actually measuring and then averaging the clearances of a sufficient number of windows in buildings which are at least five years old." Standard Chamberlin Installations have been in'use for thirty-three years, and it is possible to include in tests the time ele ment. Engineers have been employed to make tests on these standard installations which have been in use over a long period of years, and some of the results are given in the following tables. Tests were made by putting a collecting chamber on the inside of the window opening taking an ane mometer reading of the leakage over a period of thirty minutes. The wind velocities were_obtained from the U. S. Weather .Bureau, and the resultant leak age compared with the leakages found on non-weather stripped windows at the. Pittsburgh test. Of course, during the thirty-three years that Standard Chamberlin Installations have been made there have been changes and improvements in the strip and the method of installation, and for this reason tests are shown on installations that have been in use from 2 to 33 years to make sure that an average could be obtained that would cover not only the original installations but likewise all of the improvements that have been added. We submit that as a proof of efficiency, it is much more important for the Architect, Engineer, Contractor and Consumer to know what the result of a weather strip installation will be thirty or more years after the application has. been made than the result obtained immediately after installation. Certainly an installation that will remain effective over this long period of years is a much more efficient installation than one which cannot hold out excepting for a comparatively few years. CHAMBERLIN INSTALLATION POLICIES For a period of 14 years, that is, from 1893 to 1907, Chamberlin distribution and installation functioned under the licensee or dealer system. The company, therefore, had no decisive administrative influence on the sales or installation methods of these agents. In 1907, however, the Chamberlin Com pany made a radical change and for the past 18 years Chamberlin has been sold by company branches and installed by company mechanics. Thirty-three years have proven the prin ciple of Chamberlin Weather Strip design and the practicability of the theory that the installation is equally as important as the design. The founders of the Chamberlin Metal Weather Strip Company considered most important the ideal of rendering hot only the best of service but indefinite satis faction in the case of every installation. The same practical .ideal dominates the policies of the Company today. Chamberlin is not merely a manufacturing organization. It is'more than that. The problems of manufacture are well solved, the method well-perfected. Selling is a logical function based on accepted business principles, but weather strip installation, its life-long guarantee, that is the crown ing effort to accomplish and to maintain a complete and resultful transaction, the details of which are not submitted to the care of any third parties. There are two parties to a Chamberlin installation com tract, the customer and subsequent owners of any' building, and Chamberlin who is manufacturer, salesman, installer and servicer. 413