Editing Ventilation (architecture) (section)

=== Ventilation rate procedure ===
Ventilation Rate Procedure is rate based on standard and prescribes the rate at which ventilation air must be delivered to space and various means to the condition that air.<ref name="ASHRAE Standard 62">ASHRAE Standard 62</ref> Air quality is assessed (through CO<sub>2</sub> measurement) and ventilation rates are mathematically derived using constants.Indoor Air Quality Procedure uses one or more guidelines for the specification of acceptable concentrations of certain contaminants in indoor air but does not prescribe ventilation rates or air treatment methods.<ref name="ASHRAE Standard 62" /> This addresses both quantitative and subjective evaluations and is based on the Ventilation Rate Procedure. It also accounts for potential contaminants that may have no measured limits, or for which no limits are not set (such as formaldehyde off-gassing from carpet and furniture).