Carrier - 58

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Contents

Procedures for Gas Fired Furnaces INTRODUCTION The Need for Adequate Combustion Air Modern construction methods involve greater use of insulation improved vapor barriers and weather stripping with the result that both apartments and single family residences generally are much tighter structurally than they have been in the past Combustion air supply for gas fired equipment can be affected by these construction conditions be cause infiltration that existed in the past may not now be adequate Extensive use of kitchen and bath room exhaust fans and even fireplaces aggravates the situation Today s building practices invalidate the old rule of thumb of one air change by infiltration Reli ance on this practice can result in combustion air ...