I seek guidance from experts: what should be the negative pressure level in a hydrogen production converter? What is the range of fluctuations, etc.?

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As title: Natural gas hydrogen production converter with a processing capacity of 13,000 cubic meters; vertical top-firing box-type furnace, 100 burners, forced ventilation; fuel supplied by PSA exhaust gas and natural gas. What should the negative pressure in the furnace chamber be? I am skeptical about the figures of -40 to -80 Pa mentioned online; firstly, it’s impossible for such negative pressure to exist, and secondly, there might be local positive pressure at the burner nozzles. What we control is a negative pressure of around -180 Pa (at the furnace top), with an oxygen content of 8% (which is indeed high; there are special reasons for this). We would appreciate your guidance or opinions on the following questions for discussion: 1. Is there a specific standard for negative pressure control? I have operated both large and small furnaces. For small furnaces, a low negative pressure is sufficient; for large furnaces, I believe that the control of negative pressure should take into account factors such as the intensity of the fire, the temperature of the furnace walls, and the balance of heat exchange with the flue gases. It shouldn’t be the case that all furnaces are controlled using the same negative pressure value. 2. Is it normal for the negative pressure of our furnace to fluctuate by ±50 PA? 3. What is the control method for the burners, blowers, and smoke/air baffles in each plant’s conversion furnace? In our system, baffles are installed at the outlet of the fan; the motor is used to control the opening and closing of these baffles, and the inside of the baffles consists of louver blades. It seems that this control method does not provide good adjustment capabilities. What good control methods have you used? Thank you, waiting online.