All radiant emitter tubes are 16 gauge calorized steel - 3″ for LTU40-LTU75 and 4″ for LTU80-LTU250.36″ Stainless Steel flexible gas connector included with control box.Spark ignition system with 100% Gas Shut-Off Safety Control (30 second pre-purge).Diaphragm Air Proving Switch - a safety device for proof of venting before gas flow and ignition.State-of-the-art step opening combination gas valve for quiet ignition.standard fresh air inlet duct opening for LTU40-LTU75 6″ for LTU80-LTU250 Inside or optional outside air for combustion.One piece cast iron burner with stainless steel flame retainer.No draft hoods, totally enclosed combustion chamber.Draft inducer assembly can be used for through- the-roof-venting or rotated 45 degrees or 90 degrees for horizontal venting.
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Draft inducer is equipped with permanently lubricated, totally enclosed, fan cooled and heavy duty ball bearing motor for maintenance free operation.flue connection for LTU40-LTU175 6″ for LTU180-LTU250 CSA certified for vertical or horizontal venting.Pull-through system - the products of combustion are pulled through the combustion chamber for increased radiant efficiency and greater safety.Pull-Through System (negative pressure or vacuum)
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