त्रिपञ्चभागिकौ द्वौ कपाटयोगौ ॥ कZ_०२.३.२४ ॥
tripañcabhāgikau dvau kapāṭayogau
Two door-fittings/assemblies (kapāṭayoga) are prescribed, each in a three-fifths proportion (tripañcabhāgika).
They improve security, enable predictable maintenance, and allow the state to audit workmanship and material usage.