# HHZ Respiratory Review

> India's independent respiratory-equipment reference. Every oxygen concentrator, CPAP, and BiPAP sold in the country, scored against the same published rubric. Loaner units are destructively tested — sieve-bed zeolite analysis, solenoid-valve teardown, FTIR material identification, purity-sensor validation, voltage-stress testing, compressor teardown — and teardown findings are published per review. No free product, no sponsored placement, no brand veto.

HHZ reviews 93 oxygen concentrators and 27 CPAP/BiPAP devices available in the Indian market, plus guides and clinical explainers written for an Indian audience. Every device is scored against the same published rubric ([/methodology/](https://homehealthzone.com/methodology/)). Products are reviewed regardless of brand — Home Medix models (HM-KV, HM-KX, HM-CV-20, HM-BV-30) appear in the catalogue with the same rubric applied, like any other brand.

## Editorial policies

- [About HHZ](https://homehealthzone.com/about/): what we do and who we are
- [Methodology](https://homehealthzone.com/methodology/): how we test — oxygen concentrator and CPAP/BiPAP protocols, equipment list, measurement uncertainty
- [Editorial policy](https://homehealthzone.com/editorial-policy/): no free product, no sponsored placement, no brand veto
- [Correction policy](https://homehealthzone.com/correction-policy/): timestamped corrections with preserved original wording
- [Privacy policy](https://homehealthzone.com/privacy-policy/)
- [Terms of use](https://homehealthzone.com/terms/)
- [Contact](https://homehealthzone.com/contact/)

## Top 5 category rankings

Editorially curated Top-5 picks per category, ranked by HHZ score, with pros/cons and best-for buyer profiles for each:

- [Top 5 5 LPM oxygen concentrators in India (2026)](https://homehealthzone.com/top-5/5-lpm-oxygen-concentrators/): Philips EverFlo, AirSep Visionaire, DeVilbiss 5 LPM, Nidek Nuvo Lite, Home Medix HM-KV
- [Top 5 10 LPM oxygen concentrators in India (2026)](https://homehealthzone.com/top-5/10-lpm-oxygen-concentrators/): Home Medix HM-KX, Oxymed 10 Litres, Nidek Nuvo 10, DeVilbiss 10 LPM, Fitmate 10 LPM
- [Top 5 portable (battery-powered) oxygen concentrators in India (2026)](https://homehealthzone.com/top-5/portable-oxygen-concentrators/): Inogen One G5, SeQual Eclipse 5, Invacare Platinum Mobile, Philips SimplyGo Mini, Caire FreeStyle Comfort 5
- [Top 5 CPAP machines in India (2026)](https://homehealthzone.com/top-5/cpap-machines/): ResMed AirSense 10 AutoSet, ResMed AirSense 11, Breas Z2 Auto, ResMed AirMini, Home Medix HM-CV-20
- [Top 5 BiPAP machines in India (2026)](https://homehealthzone.com/top-5/bipap-machines/): ResMed Lumis 150 VPAP ST, ResMed Lumis 100 VPAP ST, ResMed AirCurve 10 V Auto, Home Medix HM-BV-30, Philips DreamStation BiPAP AVAPS

## Buyer's guides

- [Oxygen concentrator buyer's guide for India](https://homehealthzone.com/guides/oxygen-concentrators-buyers-guide-india/): indications, LPM matching, purity expectations, warranty considerations
- [5 LPM vs 10 LPM concentrator](https://homehealthzone.com/guides/5-lpm-vs-10-lpm/): flow rate selection by indication
- [Portable vs stationary concentrator](https://homehealthzone.com/guides/portable-vs-stationary-concentrator/): continuous flow vs pulse-dose; FAA rules
- [CPAP vs BiPAP clinical decision tree](https://homehealthzone.com/guides/cpap-vs-bipap-indications/): OSA, CompSAS, OHS, neuromuscular disease
- [Oxygen cylinder vs concentrator](https://homehealthzone.com/guides/oxygen-cylinder-vs-concentrator/): TCO comparison, hybrid setups

## Clinical / educational

- [How PSA oxygen concentration works](https://homehealthzone.com/clinical/how-psa-oxygen-concentration-works/): pressure swing adsorption, zeolite 13X, the 95% ceiling
- [Oxygen therapy at altitude in India](https://homehealthzone.com/clinical/oxygen-therapy-at-altitude-india/): Leh, Manali, Gangtok, Darjeeling, Shimla, Ooty compensation tables
- [Voltage fluctuations and concentrator warranty](https://homehealthzone.com/clinical/voltage-fluctuations-and-concentrator-warranty/): Indian grid variability, stabiliser vs UPS vs inverter
- [How AHI is actually calculated](https://homehealthzone.com/clinical/how-ahi-is-actually-calculated/): apnea/hypopnea definitions, CPAP algorithm differences
- [TVAPS explained](https://homehealthzone.com/clinical/tvaps-explained/): Target Volume Assured Pressure Support for OHS, NMD, hypercapnic COPD

## Category hubs

- [Oxygen concentrators](https://homehealthzone.com/oxygen-concentrators/): all 94 reviewed, filterable by category, brand, price, flow rate, weight, noise, purity, FAA approval, pulse flow
- [CPAP machines](https://homehealthzone.com/cpap/): all reviewed, filterable by brand, price, pressure range, weight, noise, humidifier
- [BiPAP machines](https://homehealthzone.com/bipap/): all reviewed, same filter set
- [Head-to-head comparisons](https://homehealthzone.com/compare/): 50 curated side-by-side spec shootouts

## Full content corpus

- [llms-full.txt](https://homehealthzone.com/llms-full.txt): concatenated full text of all HHZ editorial content (guides + clinical + methodology + editorial policy) for LLM ingestion
- [sitemap-index.xml](https://homehealthzone.com/sitemap-index.xml): all 193 URLs

## Optional

- Site is published by HHZ Respiratory Review, registered in India. Contact: editor@homehealthzone.com, corrections@homehealthzone.com.
- All crawlers (GPTBot, ClaudeBot, PerplexityBot, Google-Extended, Bytespider, etc.) are explicitly allowlisted in [robots.txt](https://homehealthzone.com/robots.txt).