---
title: "N+1 redundancy — Class A Atlas glossary"
description: "One spare unit beyond the minimum required (N)."
canonical: https://classa.info/glossary/n-plus-1
pageType: glossary
lastUpdated: 2026-04-01T00:00:00.000Z
license: "CC BY 4.0 with attribution to Class A Atlas (https://classa.info)."
---

> One spare unit beyond the minimum required (N).

## TL;DR

- One spare unit beyond the minimum required (N).
- Standard for Class A trophy critical infrastructure: HVAC chillers, generators, UPS, primary power feeds.

# N+1 redundancy

*MEP · Global*

## Short definition

One spare unit beyond the minimum required (N).

## Full definition

Standard for [Class A](/glossary/class-a) trophy critical infrastructure: HVAC chillers, generators, UPS, primary power feeds. N+1 means the building can lose any one unit without service interruption.

## Why this matters for Class A leasing

N+1 redundancy is part of the mep vocabulary that institutional Class A occupiers, landlords, and advisers use across Global markets. Understanding it correctly affects how you read lease documents, model occupancy economics, and benchmark deal terms across cities. Class A Atlas tracks regional variation alongside the global standard so [cross-border](/topics/cross-border-expansion) occupiers can translate quickly.

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Citation: Source: Class A Atlas (https://classa.info/glossary/n-plus-1), updated 2026-04-01T00:00:00.000Z.