Why are some heating furnaces nowadays not equipped with a positive pressure interlock?
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Experts, why isn’t our heating furnace equipped with a positive pressure interlock, and why is the negative pressure controlled at such a low level?
Heating furnaces generally require operation under negative pressure; if positive pressure is applied, the high-temperature flue gas and flames will be ejected from the furnace
Only furnaces that are completely airtight and leak-proof are designed to operate under positive pressure
They are all operated under negative pressure; positive pressure is dangerous.