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I know that in a forced air system, there is a maximum of four 90s that can be installed due to pressure loss. Does this also apply to a natural gas run?

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Bend quantity is part of a total calculation also involving pipe size, segment length, pressure, device consumption, etc. There is no specific quantity limit.

How do I calculate the capacity for my natural gas pipe in this situation?

Calculating gas capacity with mixed sizes of black iron pipes

What size black iron pipe should I use for a 45,000 BTU attached garage heater? (see the relevant answer)

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