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Earlier editions: 20222019

Chapter 12 — HYDRONICS

1217.6 Tube Length — 2025 California Mechanical Code

California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-09-25 · California

CBSC: official editions, supplements and errata

Italicized text is a California amendment to the model code, as printed in the official publication.

Cite as: 2025 California Mechanical Code (Title 24, Part 4) § 1217.6 · Effective January 1, 2026 · Official source: Building Standards Commission

The maximum loop length of continuous tubing from a supply-and-return manifold shall not exceed the lengths specified by the manufacturer or, in the absence of manufacturer’s specifications, the lengths specified in Table 1217.6. Actual loop lengths shall be determined by spacing, flow rate, and pressure drop requirements as specified in the system design.

TABLE 1217.6

MAXIMUM LENGTH OF CONTINUOUS TUBING FROM

A SUPPLY-AND-RETURN MANIFOLD ARRANGEMENT

NOMINAL TUBE SIZE
(inches)		 MAXIMUM LOOP LENGTH
(feet)

1/4		 125

5/16		 200

3/8		 250

1/2		 300
5/8 400


3/4		 500

1		 750

For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm

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▸Contents — California Mechanical Code (Title 24, Part 4)
California Mechanical Code (Title 24, Part 4)

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