Fresh Air Ventilation in Ahmedabad
Hot arid — among India's hottest and driest cities

What makes ventilation difficult in Ahmedabad?
Ahmedabad regularly records India's highest summer temperatures (46–48°C). However, it is also one of India's driest — humidity drops below 20% RH in peak summer. Extreme heat with very low humidity is a unique ventilation profile.
Which machine is right for Ahmedabad?
Revita ERV + MERV-13 (Standard) · RHP (Premium for extreme summer)
Ahmedabad's dry climate means ERV moisture transfer is actually beneficial (prevents air from being too dry). Heat recovery at 46°C outdoor temperature is critical. For premium: RHP provides active cooling making fresh air comfortable at peak temperatures. HEPA-13 essential for homes near GIDC Naroda, Vatva, or Odhav industrial estates.
For Ahmedabad we specify Revita ERV as the default, with MERV-13 (HEPA-13 near GIDC industrial zones) filtration. Models: Revita INA-MFQR series (standard), RHP INA-RHP Series (premium). Model-by-model airflow, static pressure and power figures are on the spec sheets.
Typically installed in: Apartments · Premium villas · Commercial offices · Healthcare.
Also worth considering: Standard Revita ERV sufficient for most residential; RHP warranted for large commercial or premium residential
How is a system sized here?
Sizing is driven by occupancy, not floor area — CO2 comes from people, so a small crowded flat needs more air than a large empty one. ASHRAE 62.1 sets the airflow per person; that number picks the unit. Ahmedabad then adds two local constraints: a summer peak of 44–48°C, which decides how much heat recovery is worth paying for, and humidity of 15–30% RH (summer), which decides whether plain recovery is enough or whether active dehumidification is needed.