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It should be noted
that demand for recirculating direct gas-fired systems has fallen in
recent years. Indoor Air Quality concerns, more stringent regulations
passed in recent years, and 2003, new ANSI Standards took effect.
Formerly, both recirculating and 100% fresh air units were covered by
the same standard. Today, ANSI Z83.4 applies to 100% Fresh Air Units
and ANSI Z83.18 applies to Recirculating Units. Buffalo Blower Co. has
been developing Direct Fired Industrial Make-Up Air Systems for air
temperature control at large industrial plants. The airflow vs.
pressure information for a particular fan is called the fan performance
data. The performance of a fan depends on the size, shape & speed
of the impeller. The fan performance data is essential for selecting
fans as per the desired airflow and system pressure.
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