The Apex-CBT is a revolution in central heating and is made by the experts in catalytic technology. Tested using the CSA-B415.1 method, the Apex-CBT produces a mere 3.3 grams per hour of emissions and is rated for efficiency levels of 87.2% (higher heating value) and 90.7% (lower heating value). The large, 5.7–cubic-foot firebox takes logs of up to 26 inches in length and can be used as an add-on furnace for an existing central-heating system—or as a stand-alone furnace, when used with the company’s VB1000 blower.