AACA Ammoniacal copper arsenate. One of several varieties of toxic pesticides used in pressure-treated wood; see also CCA (chromated copper arsenate). ACH ACH stands for Air Changes per Hour. This is a metric of house air tightness. ACH is often expressed as ACH50, which is the air changes per hour when the house is depressurized to -50 pascals during a blower door test. The term ACHn or NACH refers to [...]

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