/** Air-loop port systems — what duct runs and fittings snap to. */
export declare const DUCT_PORT_SYSTEMS: readonly ['supply', 'return'];
/** DWV port systems — what drain / waste / vent pipe runs snap to. */
export declare const DWV_PORT_SYSTEMS: readonly ['waste', 'vent'];
/** Refrigerant-loop port system — what linesets snap to. */
export declare const REFRIGERANT_PORT_SYSTEMS: readonly ['refrigerant'];
/** Half a run's section, in metres, from its nominal size in inches: how far its centerline sits off a support. */
export declare function runSectionHalfSizeM(nominalInches: number): number;
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