Trash Room Exhaust Calculator
Exhaust airflow for a refuse or trash compactor room.
Enter your values
Enter the room area in sq ft.
Enter the ceiling height in ft.
Enter the area-based rate in CFM/sq ft.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Required exhaust
- 250 CFM
- Area basis
- 225 CFM
- 10 ACH basis
- 250 CFM
- Pressure
- Hold room negative to corridor to contain odour
Quick answer
Trash and refuse rooms are commonly exhausted continuously at about 1-2 CFM per square foot, or a minimum of 10 air changes per hour, held negative to adjacent spaces.
CFM = max(area x rate, volume x 10 ACH / 60)
At a glance
| What it does | Exhaust airflow for a refuse or trash compactor room. |
|---|---|
| Category | HVAC & Airflow |
| Inputs needed | Room area, Ceiling height, Area-based rate |
| Main output | Required exhaust |
| Formula | CFM = max(area x rate, volume x 10 ACH / 60) |
| Cost | Free — no sign-up, no download |
How to use the Trash Room Exhaust Calculator
- 1Enter the trash room's floor area and ceiling height.
- 2Compare the area-based rate to a minimum 10 air-changes-per-hour target.
- 3Hold the room negative to adjoining corridors so odours do not migrate.
Inputs explained
- Room area(sq ft)
- Enter the room area in sq ft.
- Ceiling height(ft)
- Enter the ceiling height in ft.
- Area-based rate(CFM/sq ft)
- Enter the area-based rate in CFM/sq ft.
Worked example
Using the values the calculator loads with:
Inputs
- Room area150 sq ft
- Ceiling height10 ft
- Area-based rate1.5 CFM/sq ft
Results
- Required exhaust250 CFM
- Area basis225 CFM
- 10 ACH basis250 CFM
- PressureHold room negative to corridor to contain odour
Frequently asked questions
Does refrigeration replace the need for exhaust?
No — refrigerated trash rooms still need exhaust ventilation for odour and moisture control, especially near the compactor.
Should the fan run continuously?
Yes, continuous low-level exhaust is standard for trash rooms to prevent odour buildup between pickups.
What do I need to enter into the Trash Room Exhaust Calculator?
Just 3 values: room area, ceiling height, area-based rate. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Trash Room Exhaust Calculator work out the answer?
Trash and refuse rooms are commonly exhausted continuously at about 1-2 CFM per square foot, or a minimum of 10 air changes per hour, held negative to adjacent spaces. It applies the formula CFM = max(area x rate, volume x 10 ACH / 60) and shows the working so you can check each step by hand.
Is the Trash Room Exhaust Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.