Tjernlund Products offers a rooftop chimney fan that solves draft and exhaust problems. RT-Series inducers are available with an optional constant operating pressure control. The COP control delivers precise draft or exhaust by modulating fan speed to maintain a constant negative pressure within a vent or exhaust system as draft requirements or exhaust loads change. The RT-Series fans have a clamshell design (separate base plate and fan assembly are hinged) to facilitate installation.  

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