Recent revisions to indoor air quality (IAQ) standards require the introduction of more outdoor air, which can cause temperature consistency problems. Series 3 modulation system is designed to achieve constant discharge air temperatures as well as a 25 percent or lower turndown ratio. Any indirect-fired heater designed with a two-stage gas valve and two-speed combustion blower is suitable for a retrofit.

Maxitrol Co.
(248) 356-1400
www.maxitrol.com