Case Study 04 · Hyderabad Residential
3 BHK Apartment — Hyderabad, Under Construction
The most common InAir customer: a 3BHK apartment owner building in Kondapur or Gachibowli, asking whether to include a fresh air system during construction. This analysis documents a typical installation — airflow sizing, system cost, and what changes after day one.
350 m³/h
INA-MFQR-350 — ideal airflow
3 rooms
Bedrooms served with fresh air
800ppm
CO₂ target maintained all night
Project Parameters
LocationKondapur / Gachibowli, Hyderabad
Space3 BHK — 1,600 sq ft (150 m²)
Occupancy4 people (family of 4)
ASHRAE 62.162.5 L/s required → rounded to 350 m³/h
Recommended unitRevita INA-MFQR-350 (350 m³/h, 220V, 1-phase)
ClimateHot semi-arid · 42°C peak · 75% RH monsoon
What changes from Day 1
| Parameter | Without InAir | With InAir ERV |
|---|---|---|
| Bedroom CO₂ at night | 1,200–2,000ppm (heavy, disrupted sleep) | <800ppm (ASHRAE well-being zone) |
| PM2.5 indoor | Equals or exceeds outdoor AQI | 95%+ reduction via MERV-13 / HEPA-13 |
| Allergen load | Recirculated via AC — accumulates | Continuously diluted and exhausted |
| AC load | Baseline | Slight reduction (pre-conditioned fresh air) |
| Audible noise | AC compressor and fan: 38–45dB | InAir: 25–28dB — below perception threshold |
Installation Summary
| Item | Detail |
|---|---|
| System | 1 × INA-MFQR-350 (ceiling void) + flat duct to 3 bedrooms + living room |
| Installation phase | During false ceiling / MEP work — ducting routed cleanly before finish |
| Timeline | 10–12 days (runs parallel with AC and electrical fit-out) |
| Civil impact | 1 × 50mm external wall penetration. No wall hacking after civil finish. |
| Annual filter service | MERV-13 / HEPA-13 replacement every 12–18 months based on Hyderabad AQI |
The single most important time to install InAir is during construction — ducting adds <5% to false ceiling cost and is invisible post-handover.
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