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Air infiltration is recognized as an important factor in building energy conservation.
However, there has been some confusion concerning the effectiveness of certain products and construction techniques in controlling it. Some cellulose manufacturers, for example, claim that a primary benefit of cellulose insulation is that it reduces air infiltration in buildings. The claim usually refers to spray cellulose in exterior walls of new houses. It seems logical that high density insulations can resist air flow better than low density products. This could be important if insulation were the only material blocking air movement through exterior walls.