Compost Room Ventilation Calculator
Exhaust airflow for an indoor compost or organics room.
Enter your values
ⓘ Live results
Results
- Required exhaust
- 800 CFM
- Air changes per hour
- 12
- Odour control
- Consider biofilter or carbon scrubber on exhaust discharge
- Negative pressure
- Hold room negative to adjacent occupied spaces
Quick answer
Indoor compost and organics handling rooms are commonly exhausted continuously at 1.5-2.5 CFM per square foot to control odour, moisture and biological aerosol buildup.
CFM = area x rate
How to use the Compost Room Ventilation Calculator
- 1Enter the compost or organics handling room's area and height.
- 2Apply 1.5-2.5 CFM per sq ft continuous exhaust.
- 3Consider a biofilter or carbon scrubber on the discharge if odour complaints are a concern.
Worked example
Using the values the calculator loads with:
Inputs
- Compost room area400 sq ft
- Ceiling height10 ft
- Ventilation rate2 CFM/sq ft
Results
- Required exhaust800 CFM
- Air changes per hour12
- Odour controlConsider biofilter or carbon scrubber on exhaust discharge
- Negative pressureHold room negative to adjacent occupied spaces
Frequently asked questions
Do I need odour treatment on the exhaust?
In sensitive locations (near neighbours or building entries), yes — a biofilter or activated carbon scrubber is common.
What about bioaerosols?
Good exhaust plus PPE for workers reduces exposure; some facilities also add HEPA filtration on discharge.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.