What are the disadvantages of sharing one air duct for two furnaces?
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I would like to ask what the disadvantages are of sharing one air duct for two furnaces? Will there be uneven distribution? Why? What will be the consequences?
As long as the flux in the air duct is sufficient, there’s no problem.
There may be an impact under different pressure conditions
Sharing one air duct for two furnaces has its advantages and disadvantages. The advantage is that it allows for cost savings in investment, while the disadvantage is that the suction forces of the two furnaces affect each other, which in turn impacts the air intake volume of the furnaces, the excess air coefficient, and the proper combustion within them.
The main issue lies in adjustment; uneven distribution is inevitable. Generally, designs include the use of partitions for adjustment