Air Purifier Room Size Calculator for Kitchen
Enter your room dimensions to find the minimum CADR you need — based on AHAM's 4.8 air changes per hour standard.
Kitchens produce some of the worst indoor air pollution in your home. Gas stoves release nitrogen dioxide (NO₂) and carbon monoxide. Cooking — especially frying, searing, and broiling — generates PM2.5 particles that can spike to levels matching a busy highway. And food odors linger for hours.
A kitchen air purifier needs to handle both particles and gases, so you need a unit with HEPA + activated carbon. Standard CADR calculations still apply, but kitchens have bursts of extreme pollution (during cooking) rather than steady-state particles.
For a typical 12×14 ft kitchen (168 sq ft), you need at least 108 CFM for maintenance — but 200+ CFM if you want it to keep up during active cooking sessions.
Pro tip: place the purifier near (but not next to) the stove, where it can catch rising cooking fumes before they spread through the house.
Air Changes Per Hour (ACH) Reference
| Purifier CADR | ACH for Your Room | Rating |
|---|
💡 Tips for Kitchen Air Purifiers
- ✓ Always use your range hood vent while cooking — an air purifier supplements it, not replaces it.
- ✓ Activated carbon is essential for kitchens. HEPA alone won't capture cooking odors or gas stove emissions.
- ✓ Clean or replace pre-filters frequently in kitchens — grease particles clog them fast.
- ✓ Run the purifier on high for 15–20 minutes after cooking, then switch to low for maintenance.
📚 Related Guides
🧰 More free tools