HVAC sizing charts
Browse every duct, breaker, MCA, MOCP, electric-heat and water-heater reference table.
Browse the reference set
- Water heater expansion tank sizing
- Round metal duct sizing — 0.10 in. w.c.
- Rectangular duct sizing — 0.10 in. w.c.
- Round return duct sizing — 0.08 in. w.c.
- Rectangular return duct sizing — 0.08 in. w.c.
- Flex duct sizing
- Branch duct sizing
- Return air duct sizing
- 2 ton AC breaker and wire
- 2.5 ton AC breaker and wire
- 3 ton AC breaker and wire
- 4 ton AC breaker and wire
- MCA and MOCP
- Electric heat wire size
Other reference sets
PurposeOpen a specific reference page for the full table, source notes and use boundaries.
Last verified2026-10-07
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HVAC Calculator Pro. (2026-10-07). HVAC sizing charts. Retrieved from https://hvaccalcpro.com/charts/Stable URL
https://hvaccalcpro.com/charts/Version2026-10-07 · HVAC Calculator Pro reference data
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